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Lee S, Kwon YK, Kim M, Yi GC. Novel Polytype of III-VI Metal Chalcogenides Nano Crystals Realized in Epitaxially Grown InTe. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2308925. [PMID: 38268229 DOI: 10.1002/smll.202308925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 12/07/2023] [Indexed: 01/26/2024]
Abstract
III-VI metal chalcogenides have garnered considerable research attention as a novel group of layered van der Waals materials because of their exceptional physical properties and potential technological applications. Here, the epitaxial growth and stacking sequences of InTe is reported, an essential and intriguing material from III-VI metal chalcogenides. Aberration-corrected scanning transmission electron microscopy (STEM) is utilized to directly reveal the interlayer stacking modes and atomic structure, leading to a discussion of a new polytype. Furthermore, correlations between the stacking sequences and interlayer distances are substantiated by atomic-resolution STEM analysis, which offers evidence for strong interlayer coupling of the new polytype. It is proposed that layer-by-layer deposition is responsible for the formation of the unconventional stacking order, which is supported by ab initio density functional theory calculations. The results thus establish molecular beam epitaxy as a viable approach for synthesizing novel polytypes. The experimental validation of the InTe polytype here expands the family of materials in the III-VI metal chalcogenides while suggesting the possibility of new stacking sequences for known materials in this system.
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Affiliation(s)
- Sangmin Lee
- Department of Materials Science & Engineering and Research Institute of Advanced Materials, Seoul National University, Seoul, 08826, Republic of Korea
| | - Young-Kyun Kwon
- Department of Physics, Department of Information Display, and Research Institute for Basic Sciences, Kyung Hee University, Seoul, 02447, South Korea
| | - Miyoung Kim
- Department of Materials Science & Engineering and Research Institute of Advanced Materials, Seoul National University, Seoul, 08826, Republic of Korea
| | - Gyu-Chul Yi
- Department of Physics and Astronomy, Seoul National University, Seoul, 08826, Republic of Korea
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2
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Feng R, Wang W, Bao C, Zhang Z, Wang F, Zhang H, Yao J, Xu Y, Yu P, Ji SH, Si C, Zhou S. Selective Control of Phases and Electronic Structures of Monolayer TaTe 2. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2302297. [PMID: 37565385 DOI: 10.1002/adma.202302297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2023] [Revised: 08/01/2023] [Indexed: 08/12/2023]
Abstract
Transition metal dichalcogenide (TMDC) films exhibit rich phases and superstructures, which can be controlled by the growth conditions as well as post-growth annealing treatment. Here, the selective growth of monolayer TaTe2 films with different phases as well as superstructures using molecular beam epitaxy (MBE) is reported. Monolayer 1H-TaTe2 and 1T-TaTe2 films can be selectively controlled by varying the growth temperature, and their different electronic structures are revealed through the combination of angle-resolved photoemission spectroscopy measurements (ARPES) and first-principles calculations. Moreover, post-growth annealing of the 1H-TaTe2 film further leads to a transition from a19 × 19 $\sqrt {19}{\times }\sqrt {19}$ superstructure to a new 2 × 2 superstructure, where two gaps are observed in the electronic structure and persist up to room temperature. First-principles calculations reveal the role of the phonon instability in the formation of superstructures and the effect of local atomic distortions on the modified electronic structures. This work demonstrates the manipulation of the rich phases and superstructures of monolayer TaTe2 films by controlling the growth kinetics and post-growth annealing.
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Affiliation(s)
- Runfa Feng
- State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, 100084, P. R. China
| | - Wei Wang
- School of Materials Science and Engineering, Beihang University, Beijing, 100084, P. R. China
| | - Changhua Bao
- State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, 100084, P. R. China
| | - Zichun Zhang
- State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, 100084, P. R. China
| | - Fei Wang
- State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, 100084, P. R. China
| | - Hongyun Zhang
- State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, 100084, P. R. China
| | - Junjie Yao
- State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, 100084, P. R. China
| | - Yong Xu
- State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, 100084, P. R. China
- Frontier Science Center for Quantum Information, Beijing, 100084, P. R. China
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama, 351-0198, Japan
| | - Pu Yu
- State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, 100084, P. R. China
- Frontier Science Center for Quantum Information, Beijing, 100084, P. R. China
| | - Shuai-Hua Ji
- State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, 100084, P. R. China
| | - Chen Si
- School of Materials Science and Engineering, Beihang University, Beijing, 100084, P. R. China
| | - Shuyun Zhou
- State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, 100084, P. R. China
- Frontier Science Center for Quantum Information, Beijing, 100084, P. R. China
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3
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Lawrence EA, Huai X, Kim D, Avdeev M, Chen Y, Skorupskii G, Miura A, Ferrenti A, Waibel M, Kawaguchi S, Ng N, Kaman B, Cai Z, Schoop L, Kushwaha S, Liu F, Tran TT, Ji H. Fe Site Order and Magnetic Properties of Fe 1/4NbS 2. Inorg Chem 2023; 62:18179-18188. [PMID: 37863841 DOI: 10.1021/acs.inorgchem.3c02652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2023]
Abstract
Transition-metal dichalcogenides (TMDs) have long been attractive to researchers for their diverse properties and high degree of tunability. Most recently, interest in magnetically intercalated TMDs has resurged due to their potential applications in spintronic devices. While certain compositions featuring the absence of inversion symmetry such as Fe1/3NbS2 and Cr1/3NbS2 have garnered the most attention, the diverse compositional space afforded through the host matrix composition as well as intercalant identity and concentration is large and remains relatively underexplored. Here, we report the magnetic ground state of Fe1/4NbS2 that was determined from low-temperature neutron powder diffraction as an A-type antiferromagnet. Despite the presence of overall inversion symmetry, the pristine compound manifests spin polarization induced by the antiferromagnetic order at generic k points, based on density functional theory band-structure calculations. Furthermore, by combining synchrotron diffraction, pair distribution function, and magnetic susceptibility measurements, we find that the magnetic properties of Fe1/4NbS2 are sensitive to the Fe site order, which can be tuned via electrochemical lithiation and thermal history.
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Affiliation(s)
- Erick A Lawrence
- Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112, United States
| | - Xudong Huai
- Department of Chemistry, Clemson University, Clemson, South Carolina 29634, United States
| | - Dongwook Kim
- Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112, United States
| | - Maxim Avdeev
- Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organization, Kirrawee DC, New South Wales 2232, Australia
- School of Chemistry, University of Sydney, Sydney, New South Wales 2006, Australia
| | - Yu Chen
- Department of Materials Science and Engineering, University of California Berkeley, Berkeley, California 94720, United States
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Grigorii Skorupskii
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Akira Miura
- Graduate School of Engineering, Hokkaido University, Sapporo, Hokkaido 8628, Japan
| | - Austin Ferrenti
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Moritz Waibel
- Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112, United States
- Faculty of Physics, Ludwig-Maximilians-University, Munich, Bavaria 80539, Germany
| | - Shogo Kawaguchi
- Japan Synchrotron Radiation Research Institute, Hyogo 679-5198 Japan
| | - Nicholas Ng
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Bobby Kaman
- Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112, United States
- Department of Materials Science and Engineering, University of Illinois Urbana-Champaign, Champaign, Illinois 61820, United States
| | - Zijian Cai
- Department of Materials Science and Engineering, University of California Berkeley, Berkeley, California 94720, United States
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Leslie Schoop
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Satya Kushwaha
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Feng Liu
- Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112, United States
| | - Thao T Tran
- Department of Chemistry, Clemson University, Clemson, South Carolina 29634, United States
| | - Huiwen Ji
- Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112, United States
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4
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Ahlawat P. Crystallization of FAPbI3: Polytypes and stacking faults. J Chem Phys 2023; 159:151102. [PMID: 37846954 DOI: 10.1063/5.0165285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Accepted: 09/15/2023] [Indexed: 10/18/2023] Open
Abstract
Molecular dynamics simulations are performed to study the crystallization of formamidinium lead iodide. From all-atom simulations of the crystal growth process and the δ-α-phase transitions, we try to reveal the formation of various stack-faulted intermediate defected structures and report various polytypes of formamidinium lead iodide that are observed from simulations.
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Affiliation(s)
- Paramvir Ahlawat
- SNSF Post-doc Mobility Fellow, Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, United Kingdom and Institute of Chemical Sciences and Engineering, Ecole Polytechnique Federale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
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5
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Spitz L, Nomoto T, Kitou S, Nakao H, Kikkawa A, Francoual S, Taguchi Y, Arita R, Tokura Y, Arima TH, Hirschberger M. Entropy-Assisted, Long-Period Stacking of Honeycomb Layers in an AlB 2-Type Silicide. J Am Chem Soc 2022; 144:16866-16871. [PMID: 36066406 DOI: 10.1021/jacs.2c04995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Configurational entropy can impact crystallization processes, tipping the scales between structures of nearly equal internal energy. Using alloyed single crystals of Gd2PdSi3 in the AlB2-type structure, we explore the formation of complex layer sequences made from alternating, two-dimensional triangular and honeycomb slabs. A four-period and an eight-period stacking sequence are found to be very close in internal energy, the latter being favored by entropy associated with covering the full configuration space of interlayer bonds. Possible consequences of polytype formation on magnetism in Gd2PdSi3 are discussed.
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Affiliation(s)
- Leonie Spitz
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
| | - Takuya Nomoto
- Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Shunsuke Kitou
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
| | - Hironori Nakao
- Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan
| | - Akiko Kikkawa
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
| | - Sonia Francoual
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - Yasujiro Taguchi
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
| | - Ryotaro Arita
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan.,Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Yoshinori Tokura
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan.,Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan.,Tokyo College, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Taka-Hisa Arima
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan.,Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - Max Hirschberger
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan.,Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
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6
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Li L, Zhang S, Hu G, Guo L, Wei T, Qin W, Xiang B, Zeng C, Zhang Z, Cui P. Converting a Monolayered NbSe 2 into an Ising Superconductor with Nontrivial Band Topology via Physical or Chemical Pressuring. NANO LETTERS 2022; 22:6767-6774. [PMID: 35930622 DOI: 10.1021/acs.nanolett.2c02422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Two-dimensional transition metal dichalcogenides possessing superconductivity and strong spin-orbit coupling exhibit high in-plane upper critical fields due to Ising pairing. Yet to date, whether such systems can become topological Ising superconductors remains to be materialized. Here we show that monolayered NbSe2 can be converted into Ising superconductors with nontrivial band topology via physical or chemical pressuring. Using first-principles calculations, we first demonstrate that a hydrostatic pressure higher than 2.5 GPa can induce a p-d band inversion, rendering nontrivial band topology to NbSe2. We then illustrate that Te-doping can function as chemical pressuring in inducing nontrivial topology in NbSe2-xTex with x ≥ 0.8, due to a larger atomic radius and stronger spin-orbit coupling of Te. We also evaluate the upper critical fields within both approaches, confirming the enhanced Ising superconductivity nature, as experimentally observed. Our findings may prove to be instrumental in material realization of topological Ising superconductivity in two-dimensional systems.
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Affiliation(s)
- Leiqiang Li
- International Center for Quantum Design of Functional Materials (ICQD), and CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Shunhong Zhang
- International Center for Quantum Design of Functional Materials (ICQD), and CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Guojing Hu
- Department of Materials Science & Engineering, CAS Key Lab of Materials for Energy Conversion, Anhui Laboratory of Advanced Photon Science and Technology, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Linhai Guo
- International Center for Quantum Design of Functional Materials (ICQD), and CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Tong Wei
- International Center for Quantum Design of Functional Materials (ICQD), and CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Wei Qin
- Department of Physics, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Bin Xiang
- Department of Materials Science & Engineering, CAS Key Lab of Materials for Energy Conversion, Anhui Laboratory of Advanced Photon Science and Technology, University of Science and Technology of China, Hefei, Anhui 230026, China
- Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China
| | - Changgan Zeng
- International Center for Quantum Design of Functional Materials (ICQD), and CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
- Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China
| | - Zhenyu Zhang
- International Center for Quantum Design of Functional Materials (ICQD), and CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
- Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China
| | - Ping Cui
- International Center for Quantum Design of Functional Materials (ICQD), and CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
- Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China
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7
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Boubeche M, Wang N, Sun J, Yang P, Zeng L, Luo S, He Y, Yu J, Wang M, Cheng J, Luo H. Superconducting dome associated with the suppression and re-emergence of charge density wave states upon sulfur substitution in CuIr 2Te 4chalcogenides. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:205602. [PMID: 35226884 DOI: 10.1088/1361-648x/ac594c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Accepted: 02/28/2022] [Indexed: 06/14/2023]
Abstract
We report the path from the charge density wave (CDW)-bearing superconductor CuIr2Te4to the metal insulator transition (MIT)-bearing compound CuIr2S4by chemical alloying with the gradual substitution of S for Te. The evolution of structural and physical properties of the CuIr2Te4-xSx(0 ⩽x⩽ 4) polycrystalline system is systemically examined. The x-ray diffraction (XRD) results imply CuIr2Te4-xSx(0 ⩽x⩽ 0.5) crystallizes in a NiAs defected trigonal structure, whereas it adapts to the cubic spinel structure for 3.6 ⩽x⩽ 4 and it is a mixed phase in the doping range of 0.5 <x< 3.6. Unexpectedly, the resistivity and magnetization measurements reveal that small-concentration S substitution for Te can suppress the CDW transition, but it reappears aroundx= 0.2, and the CDW transition temperature enhances clearly asxaugments for 0.2 ⩽x⩽ 0.5. Besides, the superconducting critical temperature (Tc) first increases with S doping content and then decreases after reaching a maximumTc= 2.82 K for CuIr2Te3.85S0.15. MIT order has been observed in the spinel region (3.6 ⩽x⩽ 4) associated withTMIincreasing withxincreasing. Finally, the rich electronic phase diagram of temperature versusxfor this CuIr2Te4-xSxsystem is assembled, where the superconducting dome is associated with the suppression and re-emergence of CDW as well as MIT states at the end upon sulfur substitution in the CuIr2Te4-xSxchalcogenides.
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Affiliation(s)
- Mebrouka Boubeche
- School of Materials Science and Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, Key Lab of Polymer Composite and Functional Materials, Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices, Sun Yat-Sen University, No. 135, Xingang Xi Road, Guangzhou 510275, People's Republic of China
| | - Ningning Wang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences and School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Jianping Sun
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences and School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Pengtao Yang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences and School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Lingyong Zeng
- School of Materials Science and Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, Key Lab of Polymer Composite and Functional Materials, Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices, Sun Yat-Sen University, No. 135, Xingang Xi Road, Guangzhou 510275, People's Republic of China
| | - Shaojuan Luo
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, People's Republic of China
| | - Yiyi He
- School of Materials Science and Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, Key Lab of Polymer Composite and Functional Materials, Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices, Sun Yat-Sen University, No. 135, Xingang Xi Road, Guangzhou 510275, People's Republic of China
| | - Jia Yu
- Center for Neutron Science and Technology, School of Physics, Sun Yat-Sen University, Guangzhou 510275, People's Republic of China
| | - Meng Wang
- Center for Neutron Science and Technology, School of Physics, Sun Yat-Sen University, Guangzhou 510275, People's Republic of China
| | - Jinguang Cheng
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences and School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Huixia Luo
- School of Materials Science and Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, Key Lab of Polymer Composite and Functional Materials, Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices, Sun Yat-Sen University, No. 135, Xingang Xi Road, Guangzhou 510275, People's Republic of China
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8
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Yao J, Yang G. 2D Layered Material Alloys: Synthesis and Application in Electronic and Optoelectronic Devices. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2103036. [PMID: 34719873 PMCID: PMC8728821 DOI: 10.1002/advs.202103036] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 09/01/2021] [Indexed: 05/12/2023]
Abstract
2D layered materials (2DLMs) have come under the limelight of scientific and engineering research and broke new ground across a broad range of disciplines in the past decade. Nevertheless, the members of stoichiometric 2DLMs are relatively limited. This renders them incompetent to fulfill the multitudinous scenarios across the breadth of electronic and optoelectronic applications since the characteristics exhibited by a specific material are relatively monotonous and limited. Inspiringly, alloying of 2DLMs can markedly broaden the 2D family through composition modulation and it has ushered a whole new research domain: 2DLM alloy nano-electronics and nano-optoelectronics. This review begins with a comprehensive survey on synthetic technologies for the production of 2DLM alloys, which include chemical vapor transport, chemical vapor deposition, pulsed-laser deposition, and molecular beam epitaxy, spanning their development, as well as, advantages and disadvantages. Then, the up-to-date advances of 2DLM alloys in electronic devices are summarized. Subsequently, the up-to-date advances of 2DLM alloys in optoelectronic devices are summarized. In the end, the ongoing challenges of this emerging field are highlighted and the future opportunities are envisioned, which aim to navigate the coming exploration and fully exert the pivotal role of 2DLMs toward the next generation of electronic and optoelectronic devices.
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Affiliation(s)
- Jiandong Yao
- State Key Laboratory of Optoelectronic Materials and Technologies, Nanotechnology Research Center, School of Materials Science & Engineering, Sun Yat-sen University, Guangzhou, Guangdong, 510275, P. R. China
| | - Guowei Yang
- State Key Laboratory of Optoelectronic Materials and Technologies, Nanotechnology Research Center, School of Materials Science & Engineering, Sun Yat-sen University, Guangzhou, Guangdong, 510275, P. R. China
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9
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Hodge KL, Gray MB, Windl W, Goldberger JE. Lucky Number 13: A 13-Layer Polytype of the Alkyne Hydrogenation Catalyst CaGaGe. Inorg Chem 2021; 60:14530-14534. [PMID: 34533935 DOI: 10.1021/acs.inorgchem.1c02051] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Polytypism, the ability of materials to form crystal structures with different stacking sequences, occasionally causes materials with the same stoichiometry and similar local structures to have profoundly different properties. Herein, we discover a metastable 13-layer trigonal (13T) polytype of CaGaGe, a layered intermetallic phase comprised of [GaGe]2- honeycombs separated by Ca2+. 13T-CaGaGe is synthesized from arc-melting the elements, and its structure is elucidated via neutron powder diffraction. Air-stable 13T-CaGaGe has one misaligned [GaGe]2- layer for every 13 and transforms into the more stable 4-layer hexagonal (4H) CaGaGe polytype after annealing at 500 °C. Transition-metal-free 13T-CaGaGe shows remarkable activity in the catalytic hydrogenation of phenylacetylene to styrene and ethylbenzene, much higher than the 4H polytype. This work identifies the first 13-layer polytype for any crystal structure and further establishes the influence of polytypism on catalysis.
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Affiliation(s)
- Kelsey L Hodge
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Matthew B Gray
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Wolfgang Windl
- Department of Materials Science and Engineering, The Ohio State University, 140 West 19th Avenue, Columbus, Ohio 43210, United States
| | - Joshua E Goldberger
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
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10
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Bao JK, Bugaris DE, Zheng H, Chung DY, Kanatzidis MG. A Noncentrosymmetric Polymorph of LuRuGe. Inorg Chem 2021; 60:7827-7833. [PMID: 33998812 DOI: 10.1021/acs.inorgchem.1c00320] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report a new polymorph of LuRuGe, obtained in indium flux. This phase exhibits the noncentrosymmetric ZrNiAl-type structure with the space group P6̅2m as determined by single-crystal X-ray diffraction. This polymorph can convert into another centrosymmetric polymorph (TiNiSi-type structure, space group Pnma) at high temperatures. We performed electrical transport, magnetization, and specific heat measurements on this new phase. It shows metallic behavior with a Hall sign change from negative at 2 K to positive at 125 K. LuRuGe exhibits Pauli paramagnetism as the ground state with no local magnetic moments from either the Ru or Lu site. The Debye temperature Θ = 348 K and electronic coefficient γe = 3.6 mJ K-2 mol-1 are extracted from the low-temperature specific heat data in LuRuGe. We also carried out first-principles density functional theory calculations to map out the electronic band structure and density of states. There are several electronic bands crossing the Fermi level, supporting a multiband scenario consistent with the Hall sign change. The density of states around the Fermi level is mainly from Ru 4d and Ge 4p electrons, indicating a strong hybridization between those atomic orbitals.
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Affiliation(s)
- Jin-Ke Bao
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Daniel E Bugaris
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Huihuo Zheng
- Leadership Computing Facility, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Duck Young Chung
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Mercouri G Kanatzidis
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States.,Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
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11
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King PDC, Picozzi S, Egdell RG, Panaccione G. Angle, Spin, and Depth Resolved Photoelectron Spectroscopy on Quantum Materials. Chem Rev 2021; 121:2816-2856. [PMID: 33346644 DOI: 10.1021/acs.chemrev.0c00616] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The role of X-ray based electron spectroscopies in determining chemical, electronic, and magnetic properties of solids has been well-known for several decades. A powerful approach is angle-resolved photoelectron spectroscopy, whereby the kinetic energy and angle of photoelectrons emitted from a sample surface are measured. This provides a direct measurement of the electronic band structure of crystalline solids. Moreover, it yields powerful insights into the electronic interactions at play within a material and into the control of spin, charge, and orbital degrees of freedom, central pillars of future solid state science. With strong recent focus on research of lower-dimensional materials and modified electronic behavior at surfaces and interfaces, angle-resolved photoelectron spectroscopy has become a core technique in the study of quantum materials. In this review, we provide an introduction to the technique. Through examples from several topical materials systems, including topological insulators, transition metal dichalcogenides, and transition metal oxides, we highlight the types of information which can be obtained. We show how the combination of angle, spin, time, and depth-resolved experiments are able to reveal "hidden" spectral features, connected to semiconducting, metallic and magnetic properties of solids, as well as underlining the importance of dimensional effects in quantum materials.
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Affiliation(s)
- Phil D C King
- SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews KY16 9SS, United Kingdom
| | - Silvia Picozzi
- Consiglio Nazionale delle Ricerche, CNR-SPIN, Via dei Vestini 31, Chieti 66100, Italy
| | - Russell G Egdell
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, United Kingdom
| | - Giancarlo Panaccione
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, in Area Science Park, S.S.14, Km 163.5, I-34149 Trieste, Italy
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12
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Witteveen C, Górnicka K, Chang J, Månsson M, Klimczuk T, von Rohr FO. Polytypism and superconductivity in the NbS 2 system. Dalton Trans 2021; 50:3216-3223. [PMID: 33576758 DOI: 10.1039/d0dt03636f] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report on the phase formation and the superconducting properties in the NbS2 system. Specifically, we have performed a series of standardized solid-state syntheses in this system, which allow us to establish a comprehensive synthesis map for the formation of the two polytypes 2H-NbS2 and 3R-NbS2, respectively. We show that the identification of two polytypes by means of X-ray diffraction is not always unambiguous. Our physical property measurements on a phase-pure sample of 3R-NbS2, on a phase-pure sample of 2H-NbS2, and a mixed phase sample confirm earlier reports that 2H-NbS2 is a bulk superconductor and that 3R-NbS2 is not a superconductor above T = 1.75 K. Our results clearly show that specific heat measurements, as true bulk measurements, are crucial for the identification of superconducting materials in this and related systems. Our results indicate that for the investigation of van der Waals materials great care has to be taken on choosing the synthesis conditions for obtaining phase pure samples.
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Affiliation(s)
- Catherine Witteveen
- Department of Chemistry, University of Zürich, Winterthurerstr. 190, 8057 Zürich, Switzerland. and Department of Physics, University of Zürich, Winterthurerstr. 190, 8057 Zürich, Switzerland
| | - Karolina Górnicka
- Department of Solid State Physics, Gdansk University of Technology, 80-233 Gdansk, Poland and Advanced Materials Centre, Gdansk University of Technology, ul. Narutowicza 11/12, 80-233 Gdansk, Poland
| | - Johan Chang
- Department of Physics, University of Zürich, Winterthurerstr. 190, 8057 Zürich, Switzerland
| | - Martin Månsson
- Department of Applied Physics, KTH Royal Institute of Technology, Roslagstullsbacken 21, SE-106 91 Stockholm, Sweden
| | - Tomasz Klimczuk
- Department of Solid State Physics, Gdansk University of Technology, 80-233 Gdansk, Poland and Advanced Materials Centre, Gdansk University of Technology, ul. Narutowicza 11/12, 80-233 Gdansk, Poland
| | - Fabian O von Rohr
- Department of Chemistry, University of Zürich, Winterthurerstr. 190, 8057 Zürich, Switzerland. and Department of Physics, University of Zürich, Winterthurerstr. 190, 8057 Zürich, Switzerland
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13
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Hossain M, Qin B, Sen SK. Chemical Synthesis and Substrate Temperature Effect on Morphology of 2D Vanadium Disulfide. CRYSTAL RESEARCH AND TECHNOLOGY 2021. [DOI: 10.1002/crat.202000184] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Mongur Hossain
- Hunan Key Laboratory of Two‐Dimensional Materials, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering Hunan University Changsha 410082 China
| | - Biao Qin
- Hunan Key Laboratory of Two‐Dimensional Materials, Department of Applied Physics, School of Physics and Electronics Hunan University Changsha 410082 China
| | - Sapan Kumar Sen
- Institute of Electronics, Atomic Energy Research Establishment Bangladesh Atomic Energy Commission Dhaka 1349 Bangladesh
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14
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Hossain M, Iqbal MA, Wu J, Xie L. Chemical vapor deposition and temperature-dependent Raman characterization of two-dimensional vanadium ditelluride. RSC Adv 2021; 11:2624-2629. [PMID: 35424251 PMCID: PMC8693834 DOI: 10.1039/d0ra07868a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Accepted: 12/22/2020] [Indexed: 11/21/2022] Open
Abstract
Recently, ultrathin two-dimensional (2D) metallic vanadium dichalcogenides have attracted widespread attention because of the charge density wave (CDW) phase transition and possible ferromagnetism. Herein, we report the synthesis and temperature-dependent Raman characterization of the 2D vanadium ditelluride (VTe2). The synthesis is done by atmospheric pressure chemical vapor deposition (APCVD) using vanadium chloride (VCl3) precursor on fluorphlogopite mica, sapphire, and h-BN substrates. A large area of the thin film with thickness ∼10 nm is grown on the hexagonal boron nitride (h-BN) substrate. Temperature-dependent Raman characterization of VTe2 is conducted from room temperature to 513 K. Remarkable changes of Raman modes at around 413 K are observed, indicating the structural phase transition. Two-dimensional vanadium ditelluride has been synthesized on mica, sapphire, and h-BN substrates by atmospheric pressure chemical vapor deposition.![]()
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Affiliation(s)
- Mongur Hossain
- Hunan Key Laboratory of Two-Dimensional Materials, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University Changsha 410082 P. R. China .,CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology Beijing 100190 P. R. China .,University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Muhammad Ahsan Iqbal
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology Beijing 100190 P. R. China .,University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Juanxia Wu
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology Beijing 100190 P. R. China
| | - Liming Xie
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology Beijing 100190 P. R. China .,University of Chinese Academy of Sciences Beijing 100049 P. R. China
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15
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Measuring the Electron–Phonon Interaction in Two-Dimensional Superconductors with He-Atom Scattering. CONDENSED MATTER 2020. [DOI: 10.3390/condmat5040079] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Helium-atom scattering (HAS) spectroscopy from conducting surfaces has been shown to provide direct information on the electron–phonon interaction, more specifically the mass-enhancement factor λ from the temperature dependence of the Debye–Waller exponent, and the mode-selected electron–phonon coupling constants λQν from the inelastic HAS intensities from individual surface phonons. The recent applications of the method to superconducting ultra-thin films, quasi-1D high-index surfaces, and layered transition-metal and topological pnictogen chalcogenides are briefly reviewed.
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16
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El Baggari I, Sivadas N, Stiehl GM, Waelder J, Ralph DC, Fennie CJ, Kourkoutis LF. Direct Visualization of Trimerized States in 1T^{'}-TaTe_{2}. PHYSICAL REVIEW LETTERS 2020; 125:165302. [PMID: 33124841 DOI: 10.1103/physrevlett.125.165302] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 06/03/2020] [Accepted: 08/26/2020] [Indexed: 06/11/2023]
Abstract
Transition-metal dichalcogenides containing tellurium anions show remarkable charge-lattice modulated structures and prominent interlayer character. Using cryogenic scanning transmission electron microscopy (STEM), we map the atomic-scale structures of the high temperature (HT) and low temperature (LT) modulated phases in 1T^{'}-TaTe_{2}. At HT, we directly show in-plane metal distortions which form trimerized clusters and staggered, three-layer stacking. In the LT phase at 93 K, we visualize an additional trimerization of Ta sites and subtle distortions of Te sites by extracting structural information from contrast modulations in plan-view STEM data. Coupled with density functional theory calculations and image simulations, this approach opens the door for atomic-scale visualizations of low temperature phase transitions and complex displacements in a variety of layered systems.
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Affiliation(s)
- Ismail El Baggari
- Department of Physics, Cornell University, Ithaca, New York 14853, USA
| | - Nikhil Sivadas
- School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA
| | - Gregory M Stiehl
- Department of Physics, Cornell University, Ithaca, New York 14853, USA
| | - Jacob Waelder
- Platform for the Accelerated Realization, Analysis and Discovery of Interface Materials (PARADIM), Cornell University, Ithaca, New York 14853, USA
| | - Daniel C Ralph
- Department of Physics, Cornell University, Ithaca, New York 14853, USA
- Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, New York 14853, USA
| | - Craig J Fennie
- School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA
| | - Lena F Kourkoutis
- School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA
- Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, New York 14853, USA
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17
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Bai C, Yang Y. Signatures of nontrivial Rashba metal states in a transition metal dichalcogenides Josephson junction. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 32:465302. [PMID: 32759477 DOI: 10.1088/1361-648x/abace4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Accepted: 08/06/2020] [Indexed: 06/11/2023]
Abstract
Nontrivial Rashba metal states in conventional semiconductor materials generated by both Rashba spin-orbit coupling and ferromagnetic exchange coupling coexisting were recently predicted and exploited. Single layered transition metal dichalcogenides (TMDC) featuring those states and their potential applications have been less focused. We find that, in the materials with Rashba spin-orbit coupling only, nontrivial Rashba metallic states can be manipulated by an external gate voltage. Based on extensive numerical simulations, the relationships between the supercurrent and nontrivial Rashba metallic states in the TMDC Josephson junction have been investigated. It is shown that, in the absence of the Rashba spin-orbit coupling, the critical supercurrent exhibits a stark difference between normal Rashba metal state and anomalous Rashba metal state in the finite junction as compared to the case of the short junction. While in the case of the finite Rashba spin-orbit coupling, the critical supercurrent demonstrates a reentrant behavior when Fermi level sweeps from anomalous Rashba metal state to Rashba ring metal state. Intriguingly, not only at the conversion of the nontrivial Rashba metallic states but also in the Rashba ring metal state the reentrant behavior exhibits again, which could be well explained by the mixing of spin-triplet Cooper pairs with spin-singlet Cooper pairs in Ising superconductor. Such a reentrant effect offers a new way to detect Ising superconductivity based on the TMDC systems. Meanwhile our study also clarified that the nontrivial Rashba metallic state plays an important role in controlling the supercurrent in the TMDC Josephson junction, which is useful for designing future superconducting devices.
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Affiliation(s)
- Chunxu Bai
- College of Physics and Electronic Engineering, Xinyang Normal University, Xinyang, 464000, People's Republic of China
| | - Yanling Yang
- College of Physics and Electronic Engineering, Xinyang Normal University, Xinyang, 464000, People's Republic of China
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18
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Lim SY, Lee JU, Kim JH, Liang L, Kong X, Nguyen TTH, Lee Z, Cho S, Cheong H. Polytypism in few-layer gallium selenide. NANOSCALE 2020; 12:8563-8573. [PMID: 32248214 DOI: 10.1039/d0nr00165a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Gallium selenide (GaSe) is one of the layered group-III metal monochalcogenides, which has an indirect bandgap in the monolayer and a direct bandgap in bulk unlike other conventional transition metal dichalcogenides (TMDs) such as MoX2 and WX2 (X = S and Se). Four polytypes of bulk GaSe, designated as β-, ε-, γ-, and δ-GaSe, have been reported. Since different polytypes result in different optical and electrical properties even with the same thickness, identifying the polytype is essential in utilizing this material for various optoelectronic applications. We performed polarized Raman measurements on GaSe and found different ultra-low-frequency Raman spectra of inter-layer vibrational modes even with the same thickness due to different stacking sequences of the polytypes. By comparing the ultra-low-frequency Raman spectra with the theoretical calculations and high-resolution electron microscopy measurements, we established the correlation between the ultra-low-frequency Raman spectra and the stacking sequences of trilayer GaSe. We further found that the AB-type stacking is more stable than the AA'-type stacking in GaSe.
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Affiliation(s)
- Soo Yeon Lim
- Department of Physics, Sogang University, Seoul 04107, Korea.
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19
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Gui X, Górnicka K, Chen Q, Zhou H, Klimczuk T, Xie W. Superconductivity in Metal-Rich Chalcogenide Ta 2Se. Inorg Chem 2020; 59:5798-5802. [PMID: 32309935 PMCID: PMC7304865 DOI: 10.1021/acs.inorgchem.9b03656] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
The metal–metal
bond in metal-rich chalcogenide is known to exhibit various structures
and interesting physical properties. Ta2Se can be obtained
by both arc-melting and solid-state pellet methods. Ta2Se crystallizes a layered tetragonal structure with space group P4/nmm (No. 129; Pearson symbol tP6). Each unit cell consists of four layers of body-centered
close-packing Ta atoms sandwiched between two square nets of Se atoms,
forming the Se–Ta–Ta–Ta–Ta–Se networks.
Herein, we present magnetic susceptibility, resistivity, and heat
capacity measurements on Ta2Se, which together indicate
bulk superconductivity with Tc = 3.8(1)
K. According to first-principles calculations, the d orbitals in Ta
atoms dominate the Fermi level in Ta2Se. The flat bands
at the Γ point in the Brillouin zone yield the van Hove singularities
in the density of states around the Fermi level, which is intensified
by introducing a spin–orbit coupling effect, and thus could
be critical for the superconductivity in Ta2Se. The physical
properties, especially superconductivity, are completely different
from those of Ta-rich alloys or transition-metal dichalcogenide TaSe2. The first metal-rich chalcogenide
superconductor Ta2Se with extensive metal−metal
interactions was reported with Tc ∼
3.8 K. The electronic structures indicate the importance of d electrons
of Ta atoms in the superconductivity and lead to a high probability
of discovering more superconductors in metal-rich chalcogenides.
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Affiliation(s)
- Xin Gui
- Department of Chemistry, Louisiana State University (LSU), Baton Rouge, Louisiana 70803, United States
| | - Karolina Górnicka
- Faculty of Applied Physics and Mathematics, Gdansk University of Technology (GUT), Narutowicza 11/12, Gdansk 80-233, Poland
| | - Qiang Chen
- Department of Physics, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Haidong Zhou
- Department of Physics, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Tomasz Klimczuk
- Faculty of Applied Physics and Mathematics, Gdansk University of Technology (GUT), Narutowicza 11/12, Gdansk 80-233, Poland
| | - Weiwei Xie
- Department of Chemistry, Louisiana State University (LSU), Baton Rouge, Louisiana 70803, United States
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20
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Tanaka Y, Matsuoka H, Nakano M, Wang Y, Sasakura S, Kobayashi K, Iwasa Y. Superconducting 3 R-Ta 1+xSe 2 with Giant In-Plane Upper Critical Fields. NANO LETTERS 2020; 20:1725-1730. [PMID: 32013454 DOI: 10.1021/acs.nanolett.9b04906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Molecular-beam epitaxy (MBE) enables the stabilization of a nonequilibrium material phase, providing a powerful approach to the exploration of emergent phenomena in condensed-matter research. Here we demonstrate that one of the metallic two-dimensional (2D) materials, TaSe2, grown by MBE crystallizes into the pure 3R phase with the self-intercalated Ta atoms, 3R-Ta1+xSe2, which is thermodynamically metastable and does not exist in nature as a pure material phase. Interestingly, the thick-enough 3R-Ta1+xSe2 film exhibits a superconducting (SC) critical temperature (Tc) of 3.0 K, which is the highest among all of the polymorphs in TaSe2. Thickness-dependence measurements reveal that Tc decreases with decreasing thickness, accompanied by the development of the charge-density wave phase. The 3R-Ta1+xSe2 films exhibit large in-plane upper critical fields (Hc2) in their SC states even in the thick-enough regime, most likely due to the suppression of the interlayer hopping associated with the unique 3R stacking. Moreover, the temperature dependence of the in-plane Hc2 evolves from linear to square-root behavior with decreasing thickness, indicating crossover behavior from anisotropic three-dimensional superconductivity to 2D superconductivity. Our results unveil intriguing SC properties of metastable 3R-Ta1+xSe2 distinct from those of thermodynamically stable 2H-TaSe2, demonstrating the essential importance of the MBE-based approach to the exploration of novel quantum phenomena in 2D materials research.
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Affiliation(s)
- Yuki Tanaka
- Quantum-Phase Electronics Center and Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan
| | - Hideki Matsuoka
- Quantum-Phase Electronics Center and Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan
| | - Masaki Nakano
- Quantum-Phase Electronics Center and Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
| | - Yue Wang
- Quantum-Phase Electronics Center and Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan
| | | | | | - Yoshihiro Iwasa
- Quantum-Phase Electronics Center and Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
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21
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Deng Y, Lai Y, Zhao X, Wang X, Zhu C, Huang K, Zhu C, Zhou J, Zeng Q, Duan R, Fu Q, Kang L, Liu Y, Pennycook SJ, Wang XR, Liu Z. Controlled Growth of 3R Phase Tantalum Diselenide and Its Enhanced Superconductivity. J Am Chem Soc 2020; 142:2948-2955. [DOI: 10.1021/jacs.9b11673] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ya Deng
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Yuanming Lai
- School of Physical and Mathematical Sciences & School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore
- State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China
| | - Xiaoxu Zhao
- Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore
| | - Xiaowei Wang
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Chao Zhu
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Ke Huang
- School of Physical and Mathematical Sciences & School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Chao Zhu
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Jiadong Zhou
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Qingsheng Zeng
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Ruihuan Duan
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Qundong Fu
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Lixing Kang
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Yang Liu
- School of Computer Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Stephen J. Pennycook
- Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore
| | - X. Renshaw Wang
- School of Physical and Mathematical Sciences & School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Zheng Liu
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
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22
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Tsai HS, Liu FW, Liou JW, Chi CC, Tang SY, Wang C, Ouyang H, Chueh YL, Liu C, Zhou S, Woon WY. Direct Synthesis of Large-Scale Multilayer TaSe 2 on SiO 2/Si Using Ion Beam Technology. ACS OMEGA 2019; 4:17536-17541. [PMID: 31656926 PMCID: PMC6812130 DOI: 10.1021/acsomega.9b02441] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Accepted: 09/24/2019] [Indexed: 05/28/2023]
Abstract
The multilayer 1T-TaSe2 is successfully synthesized by annealing a Se-implanted Ta thin film on the SiO2/Si substrate. Material analyses confirm the 1T (octahedral) structure and the quasi-2D nature of the prepared TaSe2. Temperature-dependent resistivity reveals that the multilayer 1T-TaSe2 obtained by our method undergoes a commensurate charge-density wave (CCDW) transition at around 500 K. This synthesis process has been applied to synthesize MoSe2 and HfSe2 and expanded for synthesis of one more transition-metal dichalcogenide (TMD) material. In addition, the main issue of the process, that is, the excess metal capping on the TMD layers, is solved by the reduction of thickness of the as-deposited metal thin film in this work.
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Affiliation(s)
- Hsu-Sheng Tsai
- Institute
of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
- Research
Center of Basic Space Science, Harbin Institute
of Technology, 150001 Harbin, China
| | - Fan-Wei Liu
- Department
of Materials Science and Engineering, National
Tsing Hua University, 30013 Hsinchu, Taiwan, R.O.C.
| | - Jhe-Wei Liou
- Department
of Physics, National Central University, 32001 Taoyuan, Taiwan, R. O. C.
| | - Chong-Chi Chi
- Department
of Materials Science and Engineering, National
Tsing Hua University, 30013 Hsinchu, Taiwan, R.O.C.
| | - Shin-Yi Tang
- Department
of Materials Science and Engineering, National
Tsing Hua University, 30013 Hsinchu, Taiwan, R.O.C.
| | - Changan Wang
- Institute
of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - Hao Ouyang
- Department
of Materials Science and Engineering, National
Tsing Hua University, 30013 Hsinchu, Taiwan, R.O.C.
| | - Yu-Lun Chueh
- Department
of Materials Science and Engineering, National
Tsing Hua University, 30013 Hsinchu, Taiwan, R.O.C.
| | - Chaoming Liu
- Institute
of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
- Research
Center of Basic Space Science, Harbin Institute
of Technology, 150001 Harbin, China
| | - Shengqiang Zhou
- Institute
of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - Wei-Yen Woon
- Department
of Physics, National Central University, 32001 Taoyuan, Taiwan, R. O. C.
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23
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Wang D, Luo F, Lu M, Xie X, Huang L, Huang W. Chemical Vapor Transport Reactions for Synthesizing Layered Materials and Their 2D Counterparts. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1804404. [PMID: 31489785 DOI: 10.1002/smll.201804404] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Revised: 08/11/2019] [Indexed: 05/12/2023]
Abstract
2D materials, namely thin layers of layered materials, are attracting much attention because of their unique electronic, optical, thermal, and catalytic properties for wide applications. To advance both the fundamental studies and further practical applications, the scalable and controlled synthesis of large-sized 2D materials is desired, while there still lacks ideal approaches. Alternatively, the chemical vapor transport reaction is an old but powerful technique, and is recently adopted for synthesizing 2D materials, producing bulk crystals of layered materials or corresponding 2D films. Herein, recent advancements in synthesizing both bulk layered and 2D materials by chemical vapor transport reactions are summarized. Beginning with a brief introduction of the fundamentals of chemical vapor transport reactions, chemical vapor transport-based syntheses of bulk layered and 2D materials, mainly exampled by transition metal dichalcogenides and black phosphorus, are reviewed. Particular attention is paid to important factors that can influence the reactions and the growth mechanisms of black phosphorus. Finally, perspectives about the chemical vapor transport-based synthesis of 2D materials are discussed, intending to redraw attentions on chemical vapor transport reactions.
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Affiliation(s)
- Dongya Wang
- Key Laboratory of Flexible Electronics (KLOFE), Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), Nanjing, 211816, P. R. China
| | - Fei Luo
- Key Laboratory of Flexible Electronics (KLOFE), Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), Nanjing, 211816, P. R. China
| | - Min Lu
- Key Laboratory of Flexible Electronics (KLOFE), Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), Nanjing, 211816, P. R. China
| | - Xiaoji Xie
- Key Laboratory of Flexible Electronics (KLOFE), Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), Nanjing, 211816, P. R. China
| | - Ling Huang
- Key Laboratory of Flexible Electronics (KLOFE), Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), Nanjing, 211816, P. R. China
| | - Wei Huang
- Key Laboratory of Flexible Electronics (KLOFE), Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), Nanjing, 211816, P. R. China
- Shaanxi Institute of Flexible Electronics, Northwestern Polytechnical University, Xi'an, 710072, P. R. China
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24
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Li Y, Yu ZG, Wang L, Weng Y, Tang CS, Yin X, Han K, Wu H, Yu X, Wong LM, Wan D, Wang XR, Chai J, Zhang YW, Wang S, Wang J, Wee ATS, Breese MBH, Pennycook SJ, Venkatesan T, Dong S, Xue JM, Chen J. Electronic-reconstruction-enhanced hydrogen evolution catalysis in oxide polymorphs. Nat Commun 2019; 10:3149. [PMID: 31316069 PMCID: PMC6637208 DOI: 10.1038/s41467-019-11124-w] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Accepted: 06/21/2019] [Indexed: 11/08/2022] Open
Abstract
Transition metal oxides exhibit strong structure-property correlations, which has been extensively investigated and utilized for achieving efficient oxygen electrocatalysts. However, high-performance oxide-based electrocatalysts for hydrogen evolution are quite limited, and the mechanism still remains elusive. Here we demonstrate the strong correlations between the electronic structure and hydrogen electrocatalytic activity within a single oxide system Ti2O3. Taking advantage of the epitaxial stabilization, the polymorphism of Ti2O3 is extended by stabilizing bulk-absent polymorphs in the film-form. Electronic reconstructions are realized in the bulk-absent Ti2O3 polymorphs, which are further correlated to their electrocatalytic activity. We identify that smaller charge-transfer energy leads to a substantial enhancement in the electrocatalytic efficiency with stronger hybridization of Ti 3d and O 2p orbitals. Our study highlights the importance of the electronic structures on the hydrogen evolution activity of oxide electrocatalysts, and also provides a strategy to achieve efficient oxide-based hydrogen electrocatalysts by epitaxial stabilization of bulk-absent polymorphs.
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Affiliation(s)
- Yangyang Li
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore
| | - Zhi Gen Yu
- Institute of High Performance Computing, Singapore, 138632, Singapore
| | - Ling Wang
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore
| | - Yakui Weng
- School of Science, Nanjing University of Posts and Telecommunications (NUPT), Nanjing, 210023, China
| | - Chi Sin Tang
- Department of Physics, Faculty of Science, National University of Singapore, Singapore, 117542, Singapore
- NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore, 117456, Singapore
| | - Xinmao Yin
- Department of Physics, Faculty of Science, National University of Singapore, Singapore, 117542, Singapore
- Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore
| | - Kun Han
- School of Physical and Mathematical Sciences & School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, 639798, Singapore
| | - Haijun Wu
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore
| | - Xiaojiang Yu
- Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore
| | - Lai Mun Wong
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), #08-03, 2 Fusionopolis Way, Innovis, 138634, Singapore
| | - Dongyang Wan
- NUSNNI-NanoCore, National University of Singapore, Singapore, 117411, Singapore
| | - Xiao Renshaw Wang
- School of Physical and Mathematical Sciences & School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, 639798, Singapore
| | - Jianwei Chai
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), #08-03, 2 Fusionopolis Way, Innovis, 138634, Singapore
| | - Yong-Wei Zhang
- Institute of High Performance Computing, Singapore, 138632, Singapore
| | - Shijie Wang
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), #08-03, 2 Fusionopolis Way, Innovis, 138634, Singapore
| | - John Wang
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore
| | - Andrew T S Wee
- Department of Physics, Faculty of Science, National University of Singapore, Singapore, 117542, Singapore
- NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore, 117456, Singapore
| | - Mark B H Breese
- Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore
| | - Stephen J Pennycook
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore
- NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore, 117456, Singapore
- NUSNNI-NanoCore, National University of Singapore, Singapore, 117411, Singapore
| | - Thirumalai Venkatesan
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore
- Department of Physics, Faculty of Science, National University of Singapore, Singapore, 117542, Singapore
- NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore, 117456, Singapore
- NUSNNI-NanoCore, National University of Singapore, Singapore, 117411, Singapore
| | - Shuai Dong
- School of Physics, Southeast University, Nanjing, 211189, China
| | - Jun Min Xue
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore
| | - Jingsheng Chen
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore.
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25
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Chen Q, Cheng T, Fu H, Zhu Y. Crystal phase regulation in noble metal nanocrystals. CHINESE JOURNAL OF CATALYSIS 2019. [DOI: 10.1016/s1872-2067(19)63385-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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26
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Wang M, Zhang L, Zhong Y, Huang M, Zhen Z, Zhu H. In situ electrodeposition of polypyrrole onto TaSe 2 nanobelts quasi-arrays for high-capacitance supercapacitor. NANOSCALE 2018; 10:17341-17346. [PMID: 30198037 DOI: 10.1039/c8nr05261a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Transition metal dichalcogenides have recently revealed interesting physical properties which lead to promising applications for functional devices. TaSe2, as a member of transition metal dichalcogenides, attracts a great deal of attention as a layered electric conductor with low dimension and metallic nature. Herein, we prepare a three-dimensional conductive quasi-array based on 2H-TaSe2 nanobelts, which are synthesized directly on a tantalum foil by one step surface-assisted chemical vapor transport method. The conductive quasi-arrays are used as substrate for in situ electrodeposition of polypyrrole to form cylinder-like composite nanostructures. It is shown that the TaSe2 nanobelts can improve conductivity and stability of polypyrrole by acting as conductive and robust skeleton. A symmetric supercapacitor constructed from the composites demonstrates high areal capacitance of 835 mF cm-2 at a scan rate of 2 mV s-1, wide potential window of 1.2 V, and excellent cycling stability with 98.7% capacitance retention after 10 000 cycles. Meanwhile, the assembly process of the supercapacitor is quite simple because it does not need any additional current collector, binder or conductive additive. The nanocomposites have been verified to be a very effective way to improve electrochemical performance of polypyrrole, and are promising to be applied as supercapacitors.
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Affiliation(s)
- Min Wang
- State Key Lab of New Ceramics and Fine Processing, School of Materials Science and Engineering, and Center for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, China.
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27
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Sun K, Sun S, Zhu C, Tian H, Yang H, Li J. Hidden CDW states and insulator-to-metal transition after a pulsed femtosecond laser excitation in layered chalcogenide 1T-TaS 2- x Se x. SCIENCE ADVANCES 2018; 4:eaas9660. [PMID: 30035223 PMCID: PMC6054513 DOI: 10.1126/sciadv.aas9660] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Accepted: 06/04/2018] [Indexed: 05/29/2023]
Abstract
The hidden (H) quantum state in 1T-TaS2 has sparked considerable interest in the field of correlated electron systems. Here, we investigate ultrafast switches to stable H charge density wave (H-CDW) states observed in 1T-TaS2-x Se x , with x = 0 and 0.5 crystals, upon excitation with a single femtosecond laser pulse. In situ cooling transmission electron microscopy observations, initiated by a single femtosecond laser pumping with a low fluence, reveal a clear transition from a commensurate CDW phase (qC) to a new CDW order with qH = (1 - δ)qC for the H-CDW state (δ = 1/9) accompanied by an evident phase separation. H-CDW domain relaxation then occurs and yields a stable metallic phase under a high-fluence excitation. Furthermore, electrical resistivity measurements show that the notable drop in x = 0 and 0.5 samples associated with the appearance of H-CDW states depend on laser fluence and temperature. These results potentially provide a new perspective on the photodoping mechanism for the emergence of H-CDW states in the 1T-TaS2-x Se x family.
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Affiliation(s)
- Kai Sun
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shuaishuai Sun
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Chunhui Zhu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Huanfang Tian
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Huaixin Yang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jianqi Li
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
- Collaborative Innovation Center of Quantum Matter, Beijing 100084, China
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28
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Han GH, Duong DL, Keum DH, Yun SJ, Lee YH. van der Waals Metallic Transition Metal Dichalcogenides. Chem Rev 2018; 118:6297-6336. [PMID: 29957928 DOI: 10.1021/acs.chemrev.7b00618] [Citation(s) in RCA: 103] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Transition metal dichalcogenides are layered materials which are composed of transition metals and chalcogens of the group VIA in a 1:2 ratio. These layered materials have been extensively investigated over synthesis and optical and electrical properties for several decades. It can be insulators, semiconductors, or metals revealing all types of condensed matter properties from a magnetic lattice distorted to superconducting characteristics. Some of these also feature the topological manner. Instead of covering the semiconducting properties of transition metal dichalcogenides, which have been extensively revisited and reviewed elsewhere, here we present the structures of metallic transition metal dichalcogenides and their synthetic approaches for not only high-quality wafer-scale samples using conventional methods (e.g., chemical vapor transport, chemical vapor deposition) but also local small areas by a modification of the materials using Li intercalation, electron beam irradiation, light illumination, pressures, and strains. Some representative band structures of metallic transition metal dichalcogenides and their strong layer-dependence are reviewed and updated, both in theoretical calculations and experiments. In addition, we discuss the physical properties of metallic transition metal dichalcogenides such as periodic lattice distortion, magnetoresistance, superconductivity, topological insulator, and Weyl semimetal. Approaches to overcome current challenges related to these materials are also proposed.
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Affiliation(s)
- Gang Hee Han
- Center for Integrated Nanostructure Physics (CINAP) , Institute for Basic Science (IBS) , Suwon 16419 , Republic of Korea.,Department of Energy Science , Sungkyunkwan University , Suwon 16419 , Republic of Korea
| | - Dinh Loc Duong
- Center for Integrated Nanostructure Physics (CINAP) , Institute for Basic Science (IBS) , Suwon 16419 , Republic of Korea.,Department of Energy Science , Sungkyunkwan University , Suwon 16419 , Republic of Korea
| | - Dong Hoon Keum
- Center for Integrated Nanostructure Physics (CINAP) , Institute for Basic Science (IBS) , Suwon 16419 , Republic of Korea.,Department of Energy Science , Sungkyunkwan University , Suwon 16419 , Republic of Korea
| | - Seok Joon Yun
- Center for Integrated Nanostructure Physics (CINAP) , Institute for Basic Science (IBS) , Suwon 16419 , Republic of Korea.,Department of Energy Science , Sungkyunkwan University , Suwon 16419 , Republic of Korea
| | - Young Hee Lee
- Center for Integrated Nanostructure Physics (CINAP) , Institute for Basic Science (IBS) , Suwon 16419 , Republic of Korea.,Department of Energy Science , Sungkyunkwan University , Suwon 16419 , Republic of Korea.,Department of Physics , Sungkyunkwan University , Suwon 16419 , Republic of Korea
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29
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Bai H, Wang M, Yang X, Li Y, Ma J, Sun X, Tao Q, Li L, Xu ZA. Superconductivity in tantalum self-intercalated 4Ha-Ta 1.03Se 2. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:095703. [PMID: 29442070 DOI: 10.1088/1361-648x/aaaa98] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
TaSe2 has several different polytypes and abundant physical properties, such as superconductivity and charge density waves (CDW), which have been investigated in the past few decades. However, there has been no report on the physical properties of the 4Ha polytype up to now. Here we report the crystal growth and discovery of superconductivity in the tantalum self-intercalated 4Ha-Ta1.03Se2 single crystal with a superconducting transition onset temperature of [Formula: see text] K, which is the first observation of superconductivity in the 4Ha polytype of TaSe2. A slightly suppressed CDW transition is found around 106 K. A large [Formula: see text] value of about 4.48 is found when a magnetic field is applied in the ab-plane, which probably results from the enhanced spin-orbit coupling. Special stacking faults are observed, which further enhance the anisotropy. Although the density of states at the Fermi level is lower than that of other polytypes, T c remains the same, indicating that the stack mode of the 4Ha polytype may be beneficial to superconductivity in TaSe2.
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Affiliation(s)
- Hua Bai
- Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China
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30
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Wang X, Lin J, Zhu Y, Luo C, Suenaga K, Cai C, Xie L. Chemical vapor deposition of trigonal prismatic NbS 2 monolayers and 3R-polytype few-layers. NANOSCALE 2017; 9:16607-16611. [PMID: 29072748 DOI: 10.1039/c7nr05572b] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Group VB transition-metal dichalcogenides (TMDs) have an intriguing structure-dependent charge density wave and superconductivity. Here, we report the direct chemical vapor deposition of large-size NbS2 monolayers and few-layers with trigonal prismatic coordination and 3R polytype layer-layer stacking on hexagonal boron nitride (h-BN). The structure has been confirmed by micro-Raman spectroscopy and atomic-resolution scanning transmission electron microscopy (STEM).
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Affiliation(s)
- Xinsheng Wang
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center of Excellence for Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, P. R. China.
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31
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Recent Advances in Two-Dimensional Materials with Charge Density Waves: Synthesis, Characterization and Applications. CRYSTALS 2017. [DOI: 10.3390/cryst7100298] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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32
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Yoshida M, Ye J, Zhang Y, Imai Y, Kimura S, Fujiwara A, Nishizaki T, Kobayashi N, Nakano M, Iwasa Y. Extended Polymorphism of Two-Dimensional Material. NANO LETTERS 2017; 17:5567-5571. [PMID: 28777578 DOI: 10.1021/acs.nanolett.7b02374] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
When controlling electronic properties of bulk materials, we usually assume that the basic crystal structure is fixed. However, in two-dimensional (2D) materials, atomic structure or polymorph is attracting growing interest as a controlling parameter to functionalize their properties. Various polymorphs can exist in transition metal dichalcogenides (TMDCs) from which 2D materials are generated, and polymorphism has drastic impacts on the electronic states. Here we report the discovery of an unprecedented polymorph of a TMDC 2D material. By mechanical exfoliation, we made thin flakes from a single crystal of 2Ha-type tantalum disulfide (TaS2), a metallic TMDC with a charge-density-wave (CDW) phase. Microbeam X-ray diffraction measurements and electrical transport measurements indicate that thin flakes possess a polymorph different from any one known in TaS2 bulk crystals. Moreover, the flakes with the unique polymorph displayed the dramatically enhanced CDW ordering temperature. The present results suggest the potential existence of diverse structural and electronic phases accessible only in 2D materials.
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Affiliation(s)
- Masaro Yoshida
- RIKEN Center for Emergent Matter Science, Wako 351-0198, Japan
- Department of Applied Physics and Quantum-Phase Electronics Center, The University of Tokyo , Tokyo 113-8656, Japan
| | - Jianting Ye
- Zernike Institute for Advanced Materials, University of Groningen , 9747 AG Groningen, The Netherlands
| | - Yijin Zhang
- The Institute of Scientific and Industrial Research, Osaka University , Osaka 067-0047, Japan
- Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany
| | - Yasuhiko Imai
- Japan Synchrotron Radiation Research Institute (JASRI), Hyogo 679-5198, Japan
| | - Shigeru Kimura
- Japan Synchrotron Radiation Research Institute (JASRI), Hyogo 679-5198, Japan
| | - Akihiko Fujiwara
- School of Science and Technology, Kwansei Gakuin University , Hyogo 669-1337, Japan
| | - Terukazu Nishizaki
- Department of Electrical Engineering, Kyushu Sangyo University , Fukuoka 813-8503, Japan
| | - Norio Kobayashi
- Institute for Materials Research, Tohoku University , Sendai 980-8577, Japan
| | - Masaki Nakano
- Department of Applied Physics and Quantum-Phase Electronics Center, The University of Tokyo , Tokyo 113-8656, Japan
| | - Yoshihiro Iwasa
- RIKEN Center for Emergent Matter Science, Wako 351-0198, Japan
- Department of Applied Physics and Quantum-Phase Electronics Center, The University of Tokyo , Tokyo 113-8656, Japan
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33
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Wei L, Sun S, Guo C, Li Z, Sun K, Liu Y, Lu W, Sun Y, Tian H, Yang H, Li J. Dynamic diffraction effects and coherent breathing oscillations in ultrafast electron diffraction in layered 1 T-TaSeTe. STRUCTURAL DYNAMICS (MELVILLE, N.Y.) 2017; 4:044012. [PMID: 28470025 PMCID: PMC5404908 DOI: 10.1063/1.4979643] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2016] [Accepted: 03/21/2017] [Indexed: 05/06/2023]
Abstract
Anisotropic lattice movements due to the difference between intralayer and interlayer bonding are observed in the layered transition-metal dichalcogenide 1T-TaSeTe following femtosecond laser pulse excitation. Our ultrafast electron diffraction investigations using 4D-transmission electron microscopy (4D-TEM) clearly reveal that the intensity of Bragg reflection spots often changes remarkably due to the dynamic diffraction effects and anisotropic lattice movement. Importantly, the temporal diffracted intensity from a specific crystallographic plane depends on the deviation parameter s, which is commonly used in the theoretical study of diffraction intensity. Herein, we report on lattice thermalization and structural oscillations in layered 1T-TaSeTe, analyzed by dynamic diffraction theory. Ultrafast alterations of satellite spots arising from the charge density wave in the present system are also briefly discussed.
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Affiliation(s)
| | - Shuaishuai Sun
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Cong Guo
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | | | | | - Yu Liu
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
| | - Wenjian Lu
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
| | | | - Huanfang Tian
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
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34
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Bhoi D, Khim S, Nam W, Lee BS, Kim C, Jeon BG, Min BH, Park S, Kim KH. Interplay of charge density wave and multiband superconductivity in 2H-PdxTaSe2. Sci Rep 2016; 6:24068. [PMID: 27045426 PMCID: PMC4820724 DOI: 10.1038/srep24068] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Accepted: 03/17/2016] [Indexed: 12/03/2022] Open
Abstract
2H-TaSe2 has been one of unique transition metal dichalcogenides exhibiting several phase transitions due to a delicate balance among competing electronic ground states. An unusual metallic state at high-T is sequentially followed by an incommensurate charge density wave (ICDW) state at ≈122 K and a commensurate charge density wave (CCDW) state at ≈90 K, and superconductivity at TC ~ 0.14 K. Upon systematic intercalation of Pd ions into TaSe2, we find that CCDW order is destabilized more rapidly than ICDW to indicate a hidden quantum phase transition point at x ~ 0.09-0.10. Moreover, TC shows a dramatic enhancement up to 3.3 K at x = 0.08, ~24 times of TC in 2H-TaSe2, in proportional to the density of states N(EF). Investigations of upper critical fields Hc2 in single crystals reveal evidences of multiband superconductivity as temperature-dependent anisotropy factor γH = , quasi-linear increase of , and an upward, positive-curvature in near TC. Furthermore, analysis of temperature-dependent electronic specific heat corroborates the presence of multiple superconducting gaps. Based on above findings and electronic phase diagram vs x, we propose that the increase of N(EF) and effective electron-phonon coupling in the vicinity of CDW quantum phase transition should be a key to the large enhancement of TC in PdxTaSe2.
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Affiliation(s)
- D. Bhoi
- Center for Novel States of Complex Materials Research and Institute of Applied Physics, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea
| | - S. Khim
- Center for Novel States of Complex Materials Research and Institute of Applied Physics, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea
| | - W. Nam
- Center for Novel States of Complex Materials Research and Institute of Applied Physics, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea
| | - B. S. Lee
- Center for Novel States of Complex Materials Research and Institute of Applied Physics, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea
| | - Chanhee Kim
- Center for Novel States of Complex Materials Research and Institute of Applied Physics, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea
| | - B.-G. Jeon
- Center for Novel States of Complex Materials Research and Institute of Applied Physics, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea
| | - B. H. Min
- Center for Novel States of Complex Materials Research and Institute of Applied Physics, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea
| | - S. Park
- Center for Novel States of Complex Materials Research and Institute of Applied Physics, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea
| | - Kee Hoon Kim
- Center for Novel States of Complex Materials Research and Institute of Applied Physics, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea
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35
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Xie W, Seibel EM, Cava RJ. The New Superconductor tP-SrPd2Bi2: Structural Polymorphism and Superconductivity in Intermetallics. Inorg Chem 2016; 55:3203-5. [PMID: 27010099 DOI: 10.1021/acs.inorgchem.5b02900] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We consider a system where structural polymorphism suggests the possible existence of superconductivity through the implied structural instability. SrPd2Bi2 has two polymorphs, which can be controlled by the synthesis temperature: a tetragonal form (CaBe2Ge2-type) and a monoclinic form (BaAu2Sb2-type). Although the crystallographic difference between the two forms may, at first, seem trivial, we show that tetragonal SrPd2Bi2 is superconducting at 2.0 K, whereas monoclinic SrPd2Bi2 is not. We rationalize this finding and place it in context with other 1-2-2 phases.
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Affiliation(s)
- Weiwei Xie
- Department of Chemistry, Princeton University , Princeton, New Jersey, 08540 United States
| | - Elizabeth M Seibel
- Department of Chemistry, Princeton University , Princeton, New Jersey, 08540 United States
| | - Robert J Cava
- Department of Chemistry, Princeton University , Princeton, New Jersey, 08540 United States
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36
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Lee JU, Kim K, Han S, Ryu GH, Lee Z, Cheong H. Raman Signatures of Polytypism in Molybdenum Disulfide. ACS NANO 2016; 10:1948-1953. [PMID: 26756836 DOI: 10.1021/acsnano.5b05831] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Since the stacking order sensitively affects various physical properties of layered materials, accurate determination of the stacking order is important for studying the basic properties of these materials as well as for device applications. Because 2H-molybdenum disulfide (MoS2) is most common in nature, most studies so far have focused on 2H-MoS2. However, we found that the 2H, 3R, and mixed stacking sequences exist in few-layer MoS2 exfoliated from natural molybdenite crystals. The crystal structures are confirmed by HR-TEM measurements. The Raman signatures of different polytypes are investigated by using three different excitation energies that are nonresonant and resonant with A and C excitons, respectively. The low-frequency breathing and shear modes show distinct differences for each polytype, whereas the high-frequency intralayer modes show little difference. For resonant excitations at 1.96 and 2.81 eV, distinct features are observed that enable determination of the stacking order.
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Affiliation(s)
- Jae-Ung Lee
- Department of Physics, Sogang University , Seoul 04107, Korea
| | - Kangwon Kim
- Department of Physics, Sogang University , Seoul 04107, Korea
| | - Songhee Han
- Department of Physics, Sogang University , Seoul 04107, Korea
| | - Gyeong Hee Ryu
- School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST) , Ulsan 44919, Korea
| | - Zonghoon Lee
- School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST) , Ulsan 44919, Korea
| | - Hyeonsik Cheong
- Department of Physics, Sogang University , Seoul 04107, Korea
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37
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Luo H, Xie W, Seibel EM, Cava RJ. Superconductivity in 3R-Ta(1-x)M(x)Se2 (M = W, Mo). JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:365701. [PMID: 26289096 DOI: 10.1088/0953-8984/27/36/365701] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The 3-layer rhombohedral (3R) polytype of TaSe2-x Te x is known to display a superconducting transition temperature that is between 6 and 17 times higher than that of the two-layer hexagonal (2H) polytype. The remarkable difference in T c, although clearly associated with a difference in polytype, could have been due to an electronic effect specific to the Te-Se substitution. Here we report that small amounts of Mo or W doping lead to a 2H to 3R polytype transition in Ta1-x Mo x Se2 and Ta1-x W x Se2. The 3R polytype materials are again found to have substantially higher T c (~2 K for Ta0.9W0.1Se2 and Ta0.9Mo0.1Se2) than the 2H material (0.15 K), eliminating the possibility that any special characteristics of the Te/Se substitution are responsible for the dramatic difference in T c. We infer that a three-layer stacking sequence is strongly preferred for superconductivity over a two-layer stacking sequence in the TaSe2 system.
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Affiliation(s)
- Huixia Luo
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
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Samnakay R, Wickramaratne D, Pope TR, Lake RK, Salguero TT, Balandin AA. Zone-Folded Phonons and the Commensurate-Incommensurate Charge-Density-Wave Transition in 1T-TaSe2 Thin Films. NANO LETTERS 2015; 15:2965-73. [PMID: 25927475 DOI: 10.1021/nl504811s] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Bulk 1T-TaSe2 exhibits unusually high charge density wave (CDW) transition temperatures of 600 and 473 K below which the material exists in the incommensurate (I-CDW) and the commensurate (C-CDW) charge-density-wave phases, respectively. The (13)(1/2) × (13)(1/2) C-CDW reconstruction of the lattice coincides with new Raman peaks resulting from zone-folding of phonon modes from middle regions of the original Brillouin zone back to Γ. The C-CDW transition temperatures as a function of film thickness are determined from the evolution of these new Raman peaks, and they are found to decrease from 473 to 413 K as the film thicknesses decrease from 150 to 35 nm. A comparison of the Raman data with ab initio calculations of both the normal and C-CDW phases gives a consistent picture of the zone-folding of the phonon modes following lattice reconstruction. The Raman peak at ∼154 cm(-1) originates from the zone-folded phonons in the C-CDW phase. In the I-CDW phase, the loss of translational symmetry coincides with a strong suppression and broadening of the Raman peaks. The observed change in the C-CDW transition temperature is consistent with total energy calculations of bulk and monolayer 1T-TaSe2.
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Affiliation(s)
- R Samnakay
- †Nano-Device Laboratory (NDL), Department of Electrical and Computer Engineering, University of California-Riverside, Riverside, California 92521, United States
- ‡Phonon Optimized Engineered Materials (POEM) Center, Materials Science and Engineering Program, University of California-Riverside, Riverside, California 92521, United States
| | - D Wickramaratne
- §Laboratory for Terascale and Terahertz Electronics (LATTE), Department of Electrical and Computer Engineering, University of California-Riverside, Riverside, California 92521, United States
| | - T R Pope
- ∥Department of Chemistry, University of Georgia, Athens, Georgia 30602, United States
| | - R K Lake
- §Laboratory for Terascale and Terahertz Electronics (LATTE), Department of Electrical and Computer Engineering, University of California-Riverside, Riverside, California 92521, United States
| | - T T Salguero
- ∥Department of Chemistry, University of Georgia, Athens, Georgia 30602, United States
| | - A A Balandin
- †Nano-Device Laboratory (NDL), Department of Electrical and Computer Engineering, University of California-Riverside, Riverside, California 92521, United States
- ‡Phonon Optimized Engineered Materials (POEM) Center, Materials Science and Engineering Program, University of California-Riverside, Riverside, California 92521, United States
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