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Zhao TY, Wang AQ, Ye XG, Liu XY, Liao X, Liao ZM. Gate-Tunable Berry Curvature Dipole Polarizability in Dirac Semimetal Cd_{3}As_{2}. Phys Rev Lett 2023; 131:186302. [PMID: 37977647 DOI: 10.1103/physrevlett.131.186302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Revised: 07/10/2023] [Accepted: 10/13/2023] [Indexed: 11/19/2023]
Abstract
We reveal the gate-tunable Berry curvature dipole polarizability in Dirac semimetal Cd_{3}As_{2} nanoplates through measurements of the third-order nonlinear Hall effect. Under an applied electric field, the Berry curvature exhibits an asymmetric distribution, forming a field-induced Berry curvature dipole, resulting in a measurable third-order Hall voltage with a cubic relationship to the longitudinal electric field. Notably, the magnitude and polarity of this third-order nonlinear Hall effect can be effectively modulated by gate voltages. Furthermore, our scaling relation analysis demonstrates that the sign of the Berry curvature dipole polarizability changes when tuning the Fermi level across the Dirac point, in agreement with theoretical calculations. The results highlight the gate control of nonlinear quantum transport in Dirac semimetals, paving the way for promising advancements in topological electronics.
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Affiliation(s)
- Tong-Yang Zhao
- State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China and Hefei National Laboratory, Hefei 230088, China
| | - An-Qi Wang
- State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China and Hefei National Laboratory, Hefei 230088, China
| | - Xing-Guo Ye
- State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China and Hefei National Laboratory, Hefei 230088, China
| | - Xing-Yu Liu
- State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China and Hefei National Laboratory, Hefei 230088, China
| | - Xin Liao
- State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China and Hefei National Laboratory, Hefei 230088, China
| | - Zhi-Min Liao
- State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China and Hefei National Laboratory, Hefei 230088, China
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2
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Lv Q, Fu PH, Zhuang Q, Yu XL, Wu J. Two-dimensional antiferromagnetic nodal-line semimetal and quantum anomalous Hall state in the van der Waals heterostructure germanene/Mn 2S 2. J Phys Condens Matter 2022; 34:505702. [PMID: 36261049 DOI: 10.1088/1361-648x/ac9bb9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Accepted: 10/18/2022] [Indexed: 06/16/2023]
Abstract
Materials with interactions between the topology and magnetism are triggering increasing interest. We constructed a two-dimensional (2D) van der Waals heterostructure germanene/Mn2S2, where the germanene is a quantum spin Hall insulator and Mn2S2provides antiferromagnetic (AFM) interactions. In this structure, a 2D AFM nodal-line semimetal (NLSM) phase is expected without the spin-orbit coupling (SOC), which is of a high density of states around the Fermi level. The band touching rings originate from the intersection between different spin components ofporbitals of germanene. This result provides a possible 2D realization of NLSMs, which are usually realized in three-dimensional systems. When the SOC is present, a quantum anomalous Hall (QAH) state emerges with the annihilation of the band-touching rings. The nontrivial topology is determined by calculating the Chern number and Wannier charge centers. This provides an alternative platform to realize QAH states. These results could also provide the possibility of further understanding the topological states in NLSM and electronic applications.
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Affiliation(s)
- Qianqian Lv
- Department of Physics, Harbin Institute of Technology, Harbin 150001, People's Republic of China
- Department of Physics, Southern University of Science and Technology, Shenzhen 518055, People's Republic of China
- Shenzhen Institute for Quantum Science and Engineering (SIQSE), Southern University of Science and Technology, Shenzhen 518055, People's Republic of China
| | - Pei-Hao Fu
- Department of Physics, Harbin Institute of Technology, Harbin 150001, People's Republic of China
- Department of Physics, Southern University of Science and Technology, Shenzhen 518055, People's Republic of China
- Shenzhen Institute for Quantum Science and Engineering (SIQSE), Southern University of Science and Technology, Shenzhen 518055, People's Republic of China
| | - Quan Zhuang
- Inner Mongolia Key Laboratory of Carbon Nanomaterials, Nano Innovation Institute (NII), College of Chemistry and Materials Science, Inner Mongolia Minzu University, Tongliao 028000, People's Republic of China
| | - Xiang-Long Yu
- Shenzhen Institute for Quantum Science and Engineering (SIQSE), Southern University of Science and Technology, Shenzhen 518055, People's Republic of China
- International Quantum Academy, Shenzhen 518048, People's Republic of China
| | - Jiansheng Wu
- Shenzhen Institute for Quantum Science and Engineering (SIQSE), Southern University of Science and Technology, Shenzhen 518055, People's Republic of China
- International Quantum Academy, Shenzhen 518048, People's Republic of China
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3
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Xu L, Niu H, Bai Y, Zhu H, Yuan S, He X, Han Y, Zhao L, Yang Y, Xia Z, Liang Q, Tian Z. Shubnikov-de Haas oscillations and nontrivial topological states in Weyl semimetal candidate SmAlSi. J Phys Condens Matter 2022; 34:485701. [PMID: 36206748 DOI: 10.1088/1361-648x/ac987a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2022] [Accepted: 10/07/2022] [Indexed: 06/16/2023]
Abstract
The RAlX (R = Light rare earth; X = Ge, Si) compounds, as a family of magnetic Weyl semimetal, have recently attracted growing attention due to the tunability of Weyl nodes and its interactions with diverse magnetism by rare-earth atoms. Here, we report the magnetotransport evidence and electronic structure calculations on nontrivial band topology of SmAlSi, a new member of this family. At low temperatures, SmAlSi exhibits large non-saturated magnetoresistance (MR) (as large as ∼5500% at 2 K and 48 T) and distinct Shubnikov-de Haas (SdH) oscillations. The field dependent MRs at 2 K deviate from the semiclassical (μ0H)2variation but follow the power-law relation MR∝(μ0H)mwith a crossover fromm∼ 1.52 at low fields (μ0H< 15 T) tom∼ 1 under high fields (μ0H> 18 T), which is attributed to the existence of Weyl points and electron-hole compensated characteristics with high mobility. From the analysis of SdH oscillations, two fundamental frequencies originating from the Fermi surface pockets with non-trivialπBerry phases and small cyclotron mass can be identified, this feature is supported by the calculated electronic band structures with two Weyl pockets near the Fermi level. Our study establishes SmAlSi as a paradigm for researching the novel topological states of RAlX family.
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Affiliation(s)
- Longmeng Xu
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Haoyu Niu
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Yuming Bai
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Haipeng Zhu
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Songliu Yuan
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Xiong He
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Yibo Han
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Lingxiao Zhao
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Yang Yang
- School of Physics and Electronic Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, People's Republic of China
| | - Zhengcai Xia
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Qifeng Liang
- Department of Physics, Shaoxing University, Shaoxing 312000, People's Republic of China
| | - Zhaoming Tian
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
- Shenzhen Huazhong University of Science and Technology Research Institute, Shenzhen, Guangdong 518057, People's Republic of China
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Bao C, Li Q, Xu S, Zhou S, Zeng XY, Zhong H, Gao Q, Luo L, Sun D, Xia TL, Zhou S. Population Inversion and Dirac Fermion Cooling in 3D Dirac Semimetal Cd 3As 2. Nano Lett 2022; 22:1138-1144. [PMID: 35050626 DOI: 10.1021/acs.nanolett.1c04250] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Revealing the ultrafast dynamics of three-dimensional (3D) Dirac fermions is critical for both fundamental science and device applications. So far, how the cooling of 3D Dirac fermions differs from that of two-dimensional (2D) and whether there is population inversion are fundamental questions to be answered. Here we reveal the ultrafast dynamics of Dirac fermions in a model 3D Dirac semimetal Cd3As2 by time- and angle-resolved photoemission spectroscopy with a tunable probe photon energy. The energy- and momentum-resolved relaxation rate shows a linear dependence on the energy, suggesting Dirac fermion cooling through intraband relaxation. Moreover, a population inversion is reported based on the observation of accumulated photoexcited carriers in the conduction band with a lifetime of 3.0 ps. Our work provides direct experimental evidence for a long-lived population inversion in a 3D Dirac semimetal, which is in contrast to 2D graphene with a much shorter lifetime.
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Affiliation(s)
- Changhua Bao
- State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, P. R. China
| | - Qian Li
- State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, P. R. China
| | - Sheng Xu
- Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing 100872, P. R. China
| | - Shaohua Zhou
- State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, P. R. China
| | - Xiang-Yu Zeng
- Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing 100872, P. R. China
| | - Haoyuan Zhong
- State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, P. R. China
| | - Qixuan Gao
- State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, P. R. China
| | - Laipeng Luo
- State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, P. R. China
| | - Dong Sun
- International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, P. R. China
| | - Tian-Long Xia
- Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing 100872, 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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5
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Cheng E, Xia W, Shi X, Fang H, Wang C, Xi C, Xu S, Peets DC, Wang L, Su H, Pi L, Ren W, Wang X, Yu N, Chen Y, Zhao W, Liu Z, Guo Y, Li S. Magnetism-induced topological transition in EuAs 3. Nat Commun 2021; 12:6970. [PMID: 34848690 PMCID: PMC8635340 DOI: 10.1038/s41467-021-26482-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Accepted: 09/28/2021] [Indexed: 11/09/2022] Open
Abstract
The nature of the interaction between magnetism and topology in magnetic topological semimetals remains mysterious, but may be expected to lead to a variety of novel physics. We systematically studied the magnetic semimetal EuAs3, demonstrating a magnetism-induced topological transition from a topological nodal-line semimetal in the paramagnetic or the spin-polarized state to a topological massive Dirac metal in the antiferromagnetic ground state at low temperature. The topological nature in the antiferromagnetic state and the spin-polarized state has been verified by electrical transport measurements. An unsaturated and extremely large magnetoresistance of ~2 × 105% at 1.8 K and 28.3 T is observed. In the paramagnetic states, the topological nodal-line structure at the Y point is proven by angle-resolved photoemission spectroscopy. Moreover, a temperature-induced Lifshitz transition accompanied by the emergence of a new band below 3 K is revealed. These results indicate that magnetic EuAs3 provides a rich platform to explore exotic physics arising from the interaction of magnetism with topology.
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Affiliation(s)
- Erjian Cheng
- State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, 200433, Shanghai, China
| | - Wei Xia
- School of Physical Science and Technology, ShanghaiTech University, 200031, Shanghai, China
- ShanghaiTech Laboratory for Topological Physics, 201210, Shanghai, China
| | - Xianbiao Shi
- State Key Laboratory of Advanced Welding & Joining and Flexible Printed Electronics Technology Center, Harbin Institute of Technology, 518055, Shenzhen, China
- Key Laboratory of Micro-systems and Micro-structures Manufacturing of Ministry of Education, Harbin Institute of Technology, 150001, Harbin, China
| | - Hongwei Fang
- School of Physical Science and Technology, ShanghaiTech University, 200031, Shanghai, China
- University of Chinese Academy of Sciences, 100049, Beijing, China
| | - Chengwei Wang
- School of Physical Science and Technology, ShanghaiTech University, 200031, Shanghai, China
- State Key Laboratory of Functional Material for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 200050, Shanghai, China
| | - Chuanying Xi
- Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory of the Chinese Academy of Sciences, 230031, Hefei, Anhui, China
| | - Shaowen Xu
- Department of Physics, Shanghai University, 200444, Shanghai, China
| | - Darren C Peets
- Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 315201, Ningbo, Zhejiang, China
- Institute for Solid State and Materials Physics, Technical University of Dresden, 01062, Dresden, Germany
| | - Linshu Wang
- State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, 200433, Shanghai, China
| | - Hao Su
- School of Physical Science and Technology, ShanghaiTech University, 200031, Shanghai, China
| | - Li Pi
- Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory of the Chinese Academy of Sciences, 230031, Hefei, Anhui, China
| | - Wei Ren
- Department of Physics, Shanghai University, 200444, Shanghai, China
| | - Xia Wang
- School of Physical Science and Technology, ShanghaiTech University, 200031, Shanghai, China
| | - Na Yu
- School of Physical Science and Technology, ShanghaiTech University, 200031, Shanghai, China
| | - Yulin Chen
- School of Physical Science and Technology, ShanghaiTech University, 200031, Shanghai, China
- ShanghaiTech Laboratory for Topological Physics, 201210, Shanghai, China
- Department of Physics, University of Oxford, Oxford, OX1 3PU, UK
| | - Weiwei Zhao
- State Key Laboratory of Advanced Welding & Joining and Flexible Printed Electronics Technology Center, Harbin Institute of Technology, 518055, Shenzhen, China
- Key Laboratory of Micro-systems and Micro-structures Manufacturing of Ministry of Education, Harbin Institute of Technology, 150001, Harbin, China
| | - Zhongkai Liu
- School of Physical Science and Technology, ShanghaiTech University, 200031, Shanghai, China.
- ShanghaiTech Laboratory for Topological Physics, 201210, Shanghai, China.
| | - Yanfeng Guo
- School of Physical Science and Technology, ShanghaiTech University, 200031, Shanghai, China.
| | - Shiyan Li
- State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, 200433, Shanghai, China.
- Collaborative Innovation Center of Advanced Microstructures, 210093, Nanjing, China.
- Shanghai Research Center for Quantum Sciences, 201315, Shanghai, China.
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Lee SE, Oh MJ, Ji S, Kim J, Jun JH, Kang W, Jo Y, Jung MH. Orbit topology analyzed from π phase shift of magnetic quantum oscillations in three-dimensional Dirac semimetal. Proc Natl Acad Sci U S A 2021; 118:e2023027118. [PMID: 34266947 PMCID: PMC8307846 DOI: 10.1073/pnas.2023027118] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
With the emergence of Dirac fermion physics in the field of condensed matter, magnetic quantum oscillations (MQOs) have been used to discern the topology of orbits in Dirac materials. However, many previous researchers have relied on the single-orbit Lifshitz-Kosevich (LK) formula, which overlooks the significant effect of degenerate orbits on MQOs. Since the single-orbit LK formula is valid for massless Dirac semimetals with small cyclotron masses, it is imperative to generalize the method applicable to a wide range of Dirac semimetals, whether massless or massive. This report demonstrates how spin-degenerate orbits affect the phases in MQOs of three-dimensional massive Dirac semimetal, NbSb2 With varying the direction of the magnetic field, an abrupt π phase shift is observed due to the interference between the spin-degenerate orbits. We investigate the effect of cyclotron mass on the π phase shift and verify its close relation to the phase from the Zeeman coupling. We find that the π phase shift occurs when the cyclotron mass is half of the electron mass, indicating the effective spin gyromagnetic ratio as g s = 2. Our approach is not only useful for analyzing MQOs of massless Dirac semimetals with a small cyclotron mass but also can be used for MQOs in massive Dirac materials with degenerate orbits, especially in topological materials with a sufficiently large cyclotron mass. Furthermore, this method provides a useful way to estimate the precise g s value of the material.
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Affiliation(s)
- Sang-Eon Lee
- Department of Physics, Sogang University, Seoul 04107, Korea
| | - Myeong-Jun Oh
- Department of Physics, Kyungpook National University, Daegu 41566, Korea
| | - Sanghyun Ji
- Department of Physics, Sogang University, Seoul 04107, Korea
| | - Jinsu Kim
- Department of Physics, Sogang University, Seoul 04107, Korea
| | - Jin-Hyeon Jun
- Department of Physics, Sogang University, Seoul 04107, Korea
| | - Woun Kang
- Department of Physics, Ewha Womans University, Seoul 03760, Korea
| | - Younjung Jo
- Department of Physics, Kyungpook National University, Daegu 41566, Korea;
| | - Myung-Hwa Jung
- Department of Physics, Sogang University, Seoul 04107, Korea;
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Pal D, Kumar S, Shahi P, Dan S, Verma A, Gangwar VK, Singh M, Chakravarty S, Uwatoko Y, Saha S, Patil S, Chatterjee S. Defect induced ferromagnetic ordering and room temperature negative magnetoresistance in MoTeP. Sci Rep 2021; 11:9104. [PMID: 33907273 PMCID: PMC8079386 DOI: 10.1038/s41598-021-88669-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Accepted: 03/03/2021] [Indexed: 02/02/2023] Open
Abstract
The magneto-transport, magnetization and theoretical electronic-structure have been investigated on type-II Weyl semimetallic MoTeP. The ferromagnetic ordering is observed in the studied sample and it has been shown that the observed magnetic ordering is due to the defect states. It has also been demonstrated that the presence of ferromagnetic ordering in effect suppresses the magnetoresistance (MR) significantly. Interestingly, a change-over from positive to negative MR is observed at higher temperature which has been attributed to the dominance of spin scattering suppression.
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Affiliation(s)
- Debarati Pal
- Department of Physics, Indian Institute of Technology (Banaras Hindu University), Varanasi, 221005, India
| | - Shiv Kumar
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima City, 739-0046, Japan
| | - Prashant Shahi
- Department of Physics, D.D.U. Gorakhpur University, Gorakhpur, 273009, India
| | - Sambhab Dan
- Department of Physics, Indian Institute of Technology (Banaras Hindu University), Varanasi, 221005, India
| | - Abhineet Verma
- Department of Chemistry, Institute of Science (Banaras Hindu University), Varanasi, 221005, India
| | - Vinod K Gangwar
- Department of Physics, Indian Institute of Technology (Banaras Hindu University), Varanasi, 221005, India
| | - Mahima Singh
- Department of Physics, Indian Institute of Technology (Banaras Hindu University), Varanasi, 221005, India
| | - Sujoy Chakravarty
- UGC-DAE Consortium for Scientific Research, Kalpakkam Node, Kokilamedu, 603104, India
| | - Yoshiya Uwatoko
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba, 277-8581, Japan
| | - Satyen Saha
- Department of Chemistry, Institute of Science (Banaras Hindu University), Varanasi, 221005, India
| | - Swapnil Patil
- Department of Physics, Indian Institute of Technology (Banaras Hindu University), Varanasi, 221005, India.
| | - Sandip Chatterjee
- Department of Physics, Indian Institute of Technology (Banaras Hindu University), Varanasi, 221005, India.
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8
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Takiguchi K, Wakabayashi YK, Irie H, Krockenberger Y, Otsuka T, Sawada H, Nikolaev SA, Das H, Tanaka M, Taniyasu Y, Yamamoto H. Quantum transport evidence of Weyl fermions in an epitaxial ferromagnetic oxide. Nat Commun 2020; 11:4969. [PMID: 33037206 DOI: 10.1038/s41467-020-18646-8] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Accepted: 09/06/2020] [Indexed: 11/13/2022] Open
Abstract
Magnetic Weyl semimetals have novel transport phenomena related to pairs of Weyl nodes in the band structure. Although the existence of Weyl fermions is expected in various oxides, the evidence of Weyl fermions in oxide materials remains elusive. Here we show direct quantum transport evidence of Weyl fermions in an epitaxial 4d ferromagnetic oxide SrRuO3. We employ machine-learning-assisted molecular beam epitaxy to synthesize SrRuO3 films whose quality is sufficiently high to probe their intrinsic transport properties. Experimental observation of the five transport signatures of Weyl fermions—the linear positive magnetoresistance, chiral-anomaly-induced negative magnetoresistance, π phase shift in a quantum oscillation, light cyclotron mass, and high quantum mobility of about 10,000 cm2V−1s−1—combined with first-principles electronic structure calculations establishes SrRuO3 as a magnetic Weyl semimetal. We also clarify the disorder dependence of the transport of the Weyl fermions, which gives a clear guideline for accessing the topologically nontrivial transport phenomena. Despite various predictions, the evidence of Weyl fermions in oxide materials remains elusive. Here, the authors show evidence of Weyl fermions in quantum transport measurements in an epitaxial ferromagnetic oxide SrRuO3.
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Abstract
Characterized by bulk Dirac or Weyl cones and surface Fermi-arc states, topological semimetals have sparked enormous research interest in recent years. The nanostructures, with large surface-to-volume ratio and easy field-effect gating, provide ideal platforms to detect and manipulate the topological quantum states. Exotic physical properties originating from these topological states endow topological semimetals attractive for future topological electronics (topotronics). For example, the linear energy dispersion relation is promising for broadband infrared photodetectors, the spin-momentum locking nature of topological surface states is valuable for spintronics, and the topological superconductivity is highly desirable for fault-tolerant qubits. For real-life applications, topological semimetals in the form of nanostructures are necessary in terms of convenient fabrication and integration. Here, we review the recent progresses in topological semimetal nanostructures and start with the quantum transport properties. Then topological semimetal-based electronic devices are introduced. Finally, we discuss several important aspects that should receive great effort in the future, including controllable synthesis, manipulation of quantum states, topological field effect transistors, spintronic applications, and topological quantum computation.
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Affiliation(s)
- An-Qi Wang
- State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China
- Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
| | - Xing-Guo Ye
- State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China
| | - Da-Peng Yu
- Shenzhen Institute for Quantum Science and Engineering and Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
| | - Zhi-Min Liao
- State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China
- Collaborative Innovation Center of Quantum Matter, Peking University, Beijing 100871, China
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10
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Oveshnikov LN, Davydov AB, Suslov AV, Ril' AI, Marenkin SF, Vasiliev AL, Aronzon BA. Superconductivity and Shubnikov - de Haas effect in polycrystalline Cd 3As 2 thin films. Sci Rep 2020; 10:4601. [PMID: 32165644 DOI: 10.1038/s41598-020-61376-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Accepted: 02/21/2020] [Indexed: 11/16/2022] Open
Abstract
In this study we observed the reproducible superconducting state in Cd3As2 thin films without any external stimuli. Comparison with our previous results reveals similar qualitative behavior for films synthesized by different methods, while the difference in the values of the critical parameters clearly shows the possibility to control this state. The X-ray diffraction measurements demonstrate the presence of the tetragonal Cd3As2 crystal phase in studied films. Measurements of high-field magnetoresistance reveal pronounced Shubnikov - de Haas oscillations. The analysis of these oscillations suggests that, due to high carrier concentration in studied Cd3As2 films, the initial Dirac semimetal phase may be partially suppressed, which, however, does not contradict with possible topological nature of the observed superconductivity.
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11
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Abstract
One of the characteristics of topological materials is their nontrivial Berry phase. Experimental determination of this phase largely relies on a phase analysis of quantum oscillations. We study the angular dependence of the oscillations in a Dirac material [Formula: see text] and observe a striking spin-zero effect (i.e., vanishing oscillations accompanied with a phase inversion). This indicates that the Berry phase in [Formula: see text] remains nontrivial for arbitrary field direction, in contrast with previous reports. The Zeeman splitting is found to be proportional to the magnetic field based on the condition for the spin-zero effect in a Dirac band. Moreover, it is suggested that the Dirac band in [Formula: see text] is likely transformed into a line node other than Weyl points for the field directions at which the spin zero occurs. The results underline a largely overlooked spin factor when determining the Berry phase from quantum oscillations.
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12
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Wang H, Luo X, Chen W, Wang N, Lei B, Meng F, Shang C, Ma L, Wu T, Dai X, Wang Z, Chen X. Magnetic-field enhanced high-thermoelectric performance in topological Dirac semimetal Cd 3As 2 crystal. Sci Bull (Beijing) 2018; 63:411-418. [PMID: 36658935 DOI: 10.1016/j.scib.2018.03.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Revised: 03/13/2018] [Accepted: 03/14/2018] [Indexed: 01/21/2023]
Abstract
Thermoelectric materials can be used to convert heat to electric power through the Seebeck effect. We study magneto-thermoelectric figure of merit (ZT) in three-dimensional Dirac semimetal Cd3As2 crystal. It is found that enhancement of power factor and reduction of thermal conductivity can be realized at the same time through magnetic field although magnetoresistivity is greatly increased. ZT can be highly enhanced from 0.17 to 1.1 by more than six times around 350 K under a perpendicular magnetic field of 7 T. The huge enhancement of ZT by magnetic field arises from the linear Dirac band with large Fermi velocity and the large electric thermal conductivity in Cd3As2. Our work paves a new way to greatly enhance the thermoelectric performance in the quantum topological materials.
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Affiliation(s)
- Honghui Wang
- Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China, and Key Laboratory of Strongly-coupled Quantum Matter Physics, Chinese Academy of Sciences, Hefei 230026, China
| | - Xigang Luo
- Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China, and Key Laboratory of Strongly-coupled Quantum Matter Physics, Chinese Academy of Sciences, Hefei 230026, China
| | - Weiwei Chen
- Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China, and Key Laboratory of Strongly-coupled Quantum Matter Physics, Chinese Academy of Sciences, Hefei 230026, China
| | - Naizhou Wang
- Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China, and Key Laboratory of Strongly-coupled Quantum Matter Physics, Chinese Academy of Sciences, Hefei 230026, China
| | - Bin Lei
- Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China, and Key Laboratory of Strongly-coupled Quantum Matter Physics, Chinese Academy of Sciences, Hefei 230026, China
| | - Fanbao Meng
- Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China, and Key Laboratory of Strongly-coupled Quantum Matter Physics, Chinese Academy of Sciences, Hefei 230026, China
| | - Chao Shang
- Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China, and Key Laboratory of Strongly-coupled Quantum Matter Physics, Chinese Academy of Sciences, Hefei 230026, China
| | - Likuan Ma
- Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China, and Key Laboratory of Strongly-coupled Quantum Matter Physics, Chinese Academy of Sciences, Hefei 230026, China
| | - Tao Wu
- Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China, and Key Laboratory of Strongly-coupled Quantum Matter Physics, Chinese Academy of Sciences, Hefei 230026, China
| | - Xi Dai
- Physics Department, Hong Kong University of Science and Technology, Hong Kong, China
| | - Zhengfei Wang
- Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China, and Key Laboratory of Strongly-coupled Quantum Matter Physics, Chinese Academy of Sciences, Hefei 230026, China
| | - Xianhui Chen
- Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China, and Key Laboratory of Strongly-coupled Quantum Matter Physics, Chinese Academy of Sciences, Hefei 230026, China; High Magnetic Field Laboratory of the Chinese Academy of Sciences, Hefei 230031, China; Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
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13
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Yuan X, Cheng P, Zhang L, Zhang C, Wang J, Liu Y, Sun Q, Zhou P, Zhang DW, Hu Z, Wan X, Yan H, Li Z, Xiu F. Direct Observation of Landau Level Resonance and Mass Generation in Dirac Semimetal Cd 3As 2 Thin Films. Nano Lett 2017; 17:2211-2219. [PMID: 28244324 DOI: 10.1021/acs.nanolett.6b04778] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Three-dimensional topological Dirac semimetals have hitherto stimulated unprecedented research interests as a new class of quantum materials. Breaking certain types of symmetries has been proposed to enable the manipulation of Dirac fermions, and that was soon realized by external modulations such as magnetic fields. However, an intrinsic manipulation of Dirac states, which is more efficient and desirable, remains a significant challenge. Here, we report a systematic study of quasi-particle dynamics and band evolution in Cd3As2 thin films with controlled chromium (Cr) doping by both magneto-infrared spectroscopy and electrical transport. We observe the √B relation of inter-Landau-level resonance in Cd3As2, an important signature of ultrarelativistic massless state inaccessible in previous optical experiments. A crossover from quantum to quasi-classical behavior makes it possible to directly probe the mass of Dirac fermions. Importantly, Cr doping allows for a Dirac mass acquisition and topological phase transition enabling a desired dynamic control of Dirac fermions. Corroborating with the density-functional theory calculations, we show that the mass generation can be explained by the explicit C4 rotation symmetry breaking and the resultant Dirac gap engineering through Cr substitution for Cd atoms. The manipulation of the system symmetry and Dirac mass in Cd3As2 thin films provides a tuning knob to explore the exotic states stemming from the parent phase of Dirac semimetals.
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Affiliation(s)
- Xiang Yuan
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University , Shanghai 200433, China
- Collaborative Innovation Center of Advanced Microstructures, Fudan University , Shanghai 200433, China
| | - Peihong Cheng
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University , Shanghai 200433, China
- Collaborative Innovation Center of Advanced Microstructures, Fudan University , Shanghai 200433, China
| | - Longqiang Zhang
- National Laboratory of Solid State Microstructures, School of Physics, Nanjing University , Nanjing 210093, China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China
| | - Cheng Zhang
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University , Shanghai 200433, China
- Collaborative Innovation Center of Advanced Microstructures, Fudan University , Shanghai 200433, China
| | - Junyong Wang
- Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of Electronic Engineering, East China Normal University , Shanghai 200241, China
| | - Yanwen Liu
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University , Shanghai 200433, China
- Collaborative Innovation Center of Advanced Microstructures, Fudan University , Shanghai 200433, China
| | - Qingqing Sun
- State Key Laboratory of ASIC and System, Department of Microelectronics, Fudan University , Shanghai 200433, China
| | - Peng Zhou
- State Key Laboratory of ASIC and System, Department of Microelectronics, Fudan University , Shanghai 200433, China
| | - David Wei Zhang
- State Key Laboratory of ASIC and System, Department of Microelectronics, Fudan University , Shanghai 200433, China
| | - Zhigao Hu
- Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of Electronic Engineering, East China Normal University , Shanghai 200241, China
| | - Xiangang Wan
- National Laboratory of Solid State Microstructures, School of Physics, Nanjing University , Nanjing 210093, China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China
| | - Hugen Yan
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University , Shanghai 200433, China
- Collaborative Innovation Center of Advanced Microstructures, Fudan University , Shanghai 200433, China
| | - Zhiqiang Li
- College of Physical Science and Technology, Sichuan University , Chengdu, Sichuan 610064, China
| | - Faxian Xiu
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University , Shanghai 200433, China
- Collaborative Innovation Center of Advanced Microstructures, Fudan University , Shanghai 200433, China
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14
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Wang LX, Wang S, Li JG, Li CZ, Xu J, Yu D, Liao ZM. Magnetotransport properties near the Dirac point of Dirac semimetal Cd 3As 2 nanowires. J Phys Condens Matter 2017; 29:044003. [PMID: 27897146 DOI: 10.1088/1361-648x/29/4/044003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Three-dimensional (3D) Dirac semimetals are featured by 3D linear energy-momentum dispersion relation, which have been proposed to be a desirable system to study Dirac fermions in 3D space and Weyl fermions in solid-state materials. Significantly, to reveal exotic transport properties of Dirac semimetals, the Fermi level should be close to the Dirac point, around which the linear dispersion is retained. Here we report the magnetotransport properties near the Dirac point in Cd3As2 nanowires, manifesting the evolution of band structure under magnetic field. Ambipolar field effect is observed with the Dirac point at V g = 3.9 V. Under high magnetic field, there is a resistivity dip in transfer curve at the Dirac point, which is caused by the Zeeman splitting enhanced density of state around the Dirac point. Furthermore, the low carrier density in the nanowires makes it feasible to enter into the quantum limit regime, resulting in the quantum linear magnetoresistance being observed even at room temperature. Besides, the dramatic reduction of bulk conductivity due to the low carrier density, together with a large surface to volume ratio of the nanowire, collectively help to reveal the Shubnikov-de Haas oscillations from the surface states. Our studies on transport properties around the Dirac point therefore provide deep insights into the emerging exotic physics of Dirac and Weyl fermions.
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Affiliation(s)
- Li-Xian Wang
- State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, People's Republic of China
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15
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Zhang K, Pan H, Zhang M, Wei Z, Gao M, Song F, Wang X, Zhang R. Controllable synthesis and magnetotransport properties of Cd3As2Dirac semimetal nanostructures. RSC Adv 2017. [DOI: 10.1039/c7ra02847d] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Cd3As2nanostructures with different morphologies have been controllably synthesized by a facile CVD method. They display interesting unsaturated and/or linear magnetoresistance.
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Affiliation(s)
- Kang Zhang
- National Laboratory of Solid State Microstructures
- Collaborative Innovation Center of Advanced Microstructures
- School of Electronic Science and Engineering
- Nanjing University
- Nanjing
| | - Haiyang Pan
- National Laboratory of Solid State Microstructures
- Collaborative Innovation Center of Advanced Microstructures
- College of Physics
- Nanjing University
- Nanjing
| | - Minhao Zhang
- National Laboratory of Solid State Microstructures
- Collaborative Innovation Center of Advanced Microstructures
- School of Electronic Science and Engineering
- Nanjing University
- Nanjing
| | - Zhongxia Wei
- National Laboratory of Solid State Microstructures
- Collaborative Innovation Center of Advanced Microstructures
- College of Physics
- Nanjing University
- Nanjing
| | - Ming Gao
- National Laboratory of Solid State Microstructures
- Collaborative Innovation Center of Advanced Microstructures
- School of Electronic Science and Engineering
- Nanjing University
- Nanjing
| | - Fengqi Song
- National Laboratory of Solid State Microstructures
- Collaborative Innovation Center of Advanced Microstructures
- College of Physics
- Nanjing University
- Nanjing
| | - Xuefeng Wang
- National Laboratory of Solid State Microstructures
- Collaborative Innovation Center of Advanced Microstructures
- School of Electronic Science and Engineering
- Nanjing University
- Nanjing
| | - Rong Zhang
- National Laboratory of Solid State Microstructures
- Collaborative Innovation Center of Advanced Microstructures
- School of Electronic Science and Engineering
- Nanjing University
- Nanjing
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16
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Liu Y, Yuan X, Zhang C, Jin Z, Narayan A, Luo C, Chen Z, Yang L, Zou J, Wu X, Sanvito S, Xia Z, Li L, Wang Z, Xiu F. Zeeman splitting and dynamical mass generation in Dirac semimetal ZrTe5. Nat Commun 2016; 7:12516. [PMID: 27515493 DOI: 10.1038/ncomms12516] [Citation(s) in RCA: 123] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2016] [Accepted: 07/11/2016] [Indexed: 01/21/2023] Open
Abstract
Dirac semimetals have attracted extensive attentions in recent years. It has been theoretically suggested that many-body interactions may drive exotic phase transitions, spontaneously generating a Dirac mass for the nominally massless Dirac electrons. So far, signature of interaction-driven transition has been lacking. In this work, we report high-magnetic-field transport measurements of the Dirac semimetal candidate ZrTe5. Owing to the large g factor in ZrTe5, the Zeeman splitting can be observed at magnetic field as low as 3 T. Most prominently, high pulsed magnetic field up to 60 T drives the system into the ultra-quantum limit, where we observe abrupt changes in the magnetoresistance, indicating field-induced phase transitions. This is interpreted as an interaction-induced spontaneous mass generation of the Dirac fermions, which bears resemblance to the dynamical mass generation of nucleons in high-energy physics. Our work establishes Dirac semimetals as ideal platforms for investigating emerging correlation effects in topological matters.
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17
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Liu J, Hu J, Cao H, Zhu Y, Chuang A, Graf D, Adams DJ, Radmanesh SMA, Spinu L, Chiorescu I, Mao Z. Nearly massless Dirac fermions hosted by Sb square net in BaMnSb2. Sci Rep 2016; 6:30525. [PMID: 27466151 PMCID: PMC4964361 DOI: 10.1038/srep30525] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Accepted: 07/04/2016] [Indexed: 11/09/2022] Open
Abstract
Layered compounds AMnBi2 (A = Ca, Sr, Ba, or rare earth element) have been established as Dirac materials. Dirac electrons generated by the two-dimensional (2D) Bi square net in these materials are normally massive due to the presence of a spin-orbital coupling (SOC) induced gap at Dirac nodes. Here we report that the Sb square net in an isostructural compound BaMnSb2 can host nearly massless Dirac fermions. We observed strong Shubnikov-de Haas (SdH) oscillations in this material. From the analyses of the SdH oscillations, we find key signatures of Dirac fermions, including light effective mass (~0.052m0; m0, mass of free electron), high quantum mobility (1280 cm(2)V(-1)S(-1)) and a π Berry phase accumulated along cyclotron orbit. Compared with AMnBi2, BaMnSb2 also exhibits much more significant quasi two-dimensional (2D) electronic structure, with the out-of-plane transport showing nonmetallic conduction below 120 K and the ratio of the out-of-plane and in-plane resistivity reaching ~670. Additionally, BaMnSb2 also exhibits a G-type antiferromagnetic order below 283 K. The combination of nearly massless Dirac fermions on quasi-2D planes with a magnetic order makes BaMnSb2 an intriguing platform for seeking novel exotic phenomena of massless Dirac electrons.
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Affiliation(s)
- Jinyu Liu
- Department of Physics and Engineering Physics, Tulane University, New Orleans, LA 70018, USA
| | - Jin Hu
- Department of Physics and Engineering Physics, Tulane University, New Orleans, LA 70018, USA
| | - Huibo Cao
- Quantum Condensed Matter Division, Oak Ridge National Laboratory, TN 37830, USA
| | - Yanglin Zhu
- Department of Physics and Engineering Physics, Tulane University, New Orleans, LA 70018, USA
| | - Alyssa Chuang
- Department of Physics and Engineering Physics, Tulane University, New Orleans, LA 70018, USA
| | - D. Graf
- National High Magnetic Field Lab, Tallahassee, FL 32310, USA
| | - D. J. Adams
- Department of Physics and Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148, USA
| | - S. M. A. Radmanesh
- Department of Physics and Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148, USA
| | - L. Spinu
- Department of Physics and Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148, USA
| | - I. Chiorescu
- National High Magnetic Field Lab, Tallahassee, FL 32310, USA
- Department of Physics, Florida State University, Tallahassee, FL 32306, USA
| | - Zhiqiang Mao
- Department of Physics and Engineering Physics, Tulane University, New Orleans, LA 70018, USA
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18
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Guo ST, Sankar R, Chien YY, Chang TR, Jeng HT, Guo GY, Chou FC, Lee WL. Large transverse Hall-like signal in topological Dirac semimetal Cd3As2. Sci Rep 2016; 6:27487. [PMID: 27263441 PMCID: PMC4893742 DOI: 10.1038/srep27487] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2016] [Accepted: 05/19/2016] [Indexed: 11/30/2022] Open
Abstract
Cadmium arsenide (Cd3As2) is known for its inverted band structure and ultra-high electron mobility. It has been theoretically predicted and also confirmed by ARPES experiments to exhibit a 3D Dirac semimetal phase containing degenerate Weyl nodes. From magneto-transport measurements in high quality single crystals of Cd3As2, a small effective mass m* ≈ 0.05 me is determined from the Shubnikov-de Haas (SdH) oscillations. In certain field orientations, we find a splitting of the SdH oscillation frequency in the FFT spectrum suggesting a possible lifting of the double degeneracy in accord with the helical spin texture at outer and inner Fermi surfaces with opposite chirality predicted by our ab initio calculations. Strikingly, a large antisymmetric magnetoresistance with respect to the applied magnetic fields is uncovered over a wide temperature range in needle crystal of Cd3As2 with its long axis along [112] crystal direction. It reveals a possible contribution of intrinsic anomalous velocity term in the transport equation resulting from a unique 3D Rashba-like spin splitted bands that can be obtained from band calculations with the inclusion of Cd antisite defects.
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Affiliation(s)
- Shih-Ting Guo
- Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan
| | - R Sankar
- Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan.,Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
| | - Yung-Yu Chien
- Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan
| | - Tay-Rong Chang
- Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Horng-Tay Jeng
- Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan.,Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Guang-Yu Guo
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
| | - F C Chou
- Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
| | - Wei-Li Lee
- Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan
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19
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Abstract
Three-dimensional Dirac semimetals, three-dimensional analogues of graphene, are unusual quantum materials with massless Dirac fermions, which can be further converted to Weyl fermions by breaking time reversal or inversion symmetry. Topological surface states with Fermi arcs are predicted on the surface and have been observed by angle-resolved photoemission spectroscopy experiments. Although the exotic transport properties of the bulk Dirac cones have been demonstrated, it is still a challenge to reveal the surface states via transport measurements due to the highly conductive bulk states. Here, we show Aharonov–Bohm oscillations in individual single-crystal Cd3As2 nanowires with low carrier concentration and large surface-to-volume ratio, providing transport evidence of the surface state in three-dimensional Dirac semimetals. Moreover, the quantum transport can be modulated by tuning the Fermi level using a gate voltage, enabling a deeper understanding of the rich physics residing in Dirac semimetals. Dirac semimetals are a three-dimensional analogue of graphene that can support massless Dirac fermions in their bulk and Fermi-arc surface states. Here, the authors observe Aharonov–Bohm oscillations in transport measurements on Cd3As2 nanowires, revealing these exotic surface states.
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Affiliation(s)
- Li-Xian Wang
- State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, China
| | - Cai-Zhen Li
- State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, China
| | - Da-Peng Yu
- State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, China.,Collaborative Innovation Center of Quantum Matter, Beijing, China.,Institute of Physics and Electronic Information, Yunnan Normal University, Kunming 650500, China
| | - Zhi-Min Liao
- State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, China.,Collaborative Innovation Center of Quantum Matter, Beijing, China
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