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Li X, Wang D, Hu H, Pan Y. Designer artificial chiral kagome lattice with tunable flat bands and topological boundary states. NANOTECHNOLOGY 2024; 35:145601. [PMID: 38081065 DOI: 10.1088/1361-6528/ad1442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2023] [Accepted: 12/10/2023] [Indexed: 01/18/2024]
Abstract
The kagome lattice is a well-known model system for the investigation of strong correlation and topological electronic phenomena due to the intrinsic flat band, magnetic frustration, etc. Introducing chirality into the kagome lattice would bring about new physics due to the unique symmetry, which is still yet to be fully explored. Here we report the investigation on a two-dimensional chiral kagome lattice utilizing tight binding band calculation and topological index analysis. It is found that the periodic chiral kagome lattice would bring about a robust zero-energy flat band. Furthermore, in the Su-Schrieffer-Heeger type dimer-/trimerized breathing chiral kagome lattice with particular edge terminations, topological corner states or metallic edge states would appear, implying new candidates for the second-order topological insulator. We also proposed the construction strategy for such lattices employing the scanning tunneling microscope atom manipulation technique.
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Affiliation(s)
- Xueyan Li
- Center for Spintronics and Quantum Systems, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China
| | - Dongli Wang
- Center for Spintronics and Quantum Systems, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China
| | - Hao Hu
- Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an 710054, People's Republic of China
| | - Yi Pan
- Center for Spintronics and Quantum Systems, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China
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2
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Chen Y, Xie T, Chen Z, Cui Z, Wen C, Sa B. Predicted superconductivity in one-dimensional A 3Hf 2B 3-type electrides. RSC Adv 2023; 13:34400-34409. [PMID: 38024995 PMCID: PMC10667593 DOI: 10.1039/d3ra07383a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Accepted: 11/17/2023] [Indexed: 12/01/2023] Open
Abstract
Inorganic electrides are considered potential superconductors due to the unique properties of their anionic electrons. However, most electrides require external high-pressure conditions to exhibit considerable superconducting transition temperatures (Tc). Therefore, searching for superconducting electrides under low or moderate external pressures is of significant research interest and importance. In this work, a series of A3Hf2B3-type compounds (A = Mg, Ca, Sr, Ba; B = Si, Ge, Sn, Pb) were constructed and systematically studied based on density functional theory calculations. According to the analysis of the electronic structures and phonon dispersion spectrums, stable one-dimensional electrides Ca3Hf2Ge3, Ca3Hf2Sn3, and Sr3Hf2Pb3, were screened out. Interestingly, the superconductivity of these electrides were predicted from electron phonon coupling calculations. It is highlighted that Sr3Hf2Pb3 showed the highest Tc, reaching 4.02 K, while the Tc values of Ca3Hf2Ge3 and Ca3Hf2Sn3 were 1.16 K and 1.04 K, respectively. Moreover, the Tc value of Ca3Hf2Ge3 can be increased to 1.96 K under 20 GPa due to the effect of phonon softening. This work enriches the types of superconducting electrides and has important guiding significance for the research on constructing electrides and related superconducting materials.
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Affiliation(s)
- Yulong Chen
- Multiscale Computational Materials Facility & Materials Genome Institute, School of Materials Science and Engineering, Fuzhou University Fuzhou 350108 P. R. China
| | - Teng Xie
- Multiscale Computational Materials Facility & Materials Genome Institute, School of Materials Science and Engineering, Fuzhou University Fuzhou 350108 P. R. China
| | - Ziqiang Chen
- Multiscale Computational Materials Facility & Materials Genome Institute, School of Materials Science and Engineering, Fuzhou University Fuzhou 350108 P. R. China
| | - Zhou Cui
- Multiscale Computational Materials Facility & Materials Genome Institute, School of Materials Science and Engineering, Fuzhou University Fuzhou 350108 P. R. China
| | - Cuilian Wen
- Multiscale Computational Materials Facility & Materials Genome Institute, School of Materials Science and Engineering, Fuzhou University Fuzhou 350108 P. R. China
| | - Baisheng Sa
- Multiscale Computational Materials Facility & Materials Genome Institute, School of Materials Science and Engineering, Fuzhou University Fuzhou 350108 P. R. China
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Yi XW, Liao ZW, You JY, Gu B, Su G. Superconducting, Topological, and Transport Properties of Kagome Metals CsTi 3Bi 5 and RbTi 3Bi 5. RESEARCH (WASHINGTON, D.C.) 2023; 6:0238. [PMID: 37789987 PMCID: PMC10543885 DOI: 10.34133/research.0238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Accepted: 09/05/2023] [Indexed: 10/05/2023]
Abstract
The recently discovered ATi3Bi5 (A=Cs, Rb) exhibit intriguing quantum phenomena including superconductivity, electronic nematicity, and abundant topological states. ATi3Bi5 present promising platforms for studying kagome superconductivity, band topology, and charge orders in parallel with AV3Sb5. In this work, we comprehensively analyze various properties of ATi3Bi5 covering superconductivity under pressure and doping, band topology under pressure, thermal conductivity, heat capacity, electrical resistance, and spin Hall conductivity (SHC) using first-principles calculations. Calculated superconducting transition temperature (Tc) of CsTi3Bi5 and RbTi3Bi5 at ambient pressure are about 1.85 and 1.92 K. When subject to pressure, Tc of CsTi3Bi5 exhibits a special valley and dome shape, which arises from quasi-two-dimensional compression to three-dimensional isotropic compression within the context of an overall decreasing trend. Furthermore, Tc of RbTi3Bi5 can be effectively enhanced up to 3.09 K by tuning the kagome van Hove singularities (VHSs) and flat band through doping. Pressures can also induce abundant topological surface states at the Fermi energy (EF) and tune VHSs across EF. Additionally, our transport calculations are in excellent agreement with recent experiments, confirming the absence of charge density wave. Notably, SHC of CsTi3Bi5 can reach up to 226ℏ ·(e· Ω ·cm)-1 at EF. Our work provides a timely and detailed analysis of the rich physical properties for ATi3Bi5, offering valuable insights for further experimental verifications and investigations in this field.
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Affiliation(s)
- Xin-Wei Yi
- School of Physical Sciences,
University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zheng-Wei Liao
- School of Physical Sciences,
University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jing-Yang You
- Department of Physics, Faculty of Science,
National University of Singapore, 117551, Singapore
| | - Bo Gu
- School of Physical Sciences,
University of Chinese Academy of Sciences, Beijing 100049, China
- Kavli Institute for Theoretical Sciences, and CAS Center for Excellence in Topological Quantum Computation,
University of Chinese Academy of Sciences, Beijing 100190, China
| | - Gang Su
- School of Physical Sciences,
University of Chinese Academy of Sciences, Beijing 100049, China
- Kavli Institute for Theoretical Sciences, and CAS Center for Excellence in Topological Quantum Computation,
University of Chinese Academy of Sciences, Beijing 100190, China
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Yam KM, Zhang Y, Guo N, Jiang Z, Deng H, Zhang C. Two-dimensional graphitic metal carbides: structure, stability and electronic properties. NANOTECHNOLOGY 2023; 34:465706. [PMID: 37549662 DOI: 10.1088/1361-6528/acedb6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2023] [Accepted: 08/07/2023] [Indexed: 08/09/2023]
Abstract
Via first-principles computational modeling and calculations, we propose a new class of two-dimensional (2D) atomically thin crystals that contain metal-C3(MC3) moieties periodically distributed in a graphenic lattice, which we refer to as 2D graphitic metal carbides (g-MCs). Most g-MCs are dynamically stable as verified by the calculated phonon spectra. Our detailed chemical bonding analyzes reveal that the high stability of g-MCs can be attributed to a unique bonding feature, which manifests as the carbon-backbone-mediated metal-metal interactions. These analyzes provide new insights for understanding the stability of 2D materials. It is found that the calculated electronic band gaps and magnetic moments (per unit cell) of g-MCs can range from 0 to 1.30 eV and 0 to 4.40μB, respectively. Highly tunable electronic properties imply great potential of 2D g-MCs in various applications. As an example, we show that 2D g-MnC can be an excellent electrocatalyst towards CO2reductive reaction for the formation of formic acid with an exceptionally high loading of Mn atoms (∼43 wt%). We expect this work to simulate new experiments for fabrication and applications of g-MCs.
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Affiliation(s)
- Kah-Meng Yam
- Department of Physics, National University of Singapore, 2 Science Drive 3 117551, Singapore
- Department of Chemistry, National University of Singapore, 3 Science Drive 3 117543, Singapore
| | - Yongjie Zhang
- Department of Physics, National University of Singapore, 2 Science Drive 3 117551, Singapore
- Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, 518055, Guangdong, People's Republic of China
| | - Na Guo
- NUS (Chongqing) Research Institute, No. 16 South Huashan Road, 401123, Chongqing, People's Republic of China
| | - Zhuoling Jiang
- Department of Physics, National University of Singapore, 2 Science Drive 3 117551, Singapore
| | - Hui Deng
- Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, 518055, Guangdong, People's Republic of China
| | - Chun Zhang
- Department of Physics, National University of Singapore, 2 Science Drive 3 117551, Singapore
- Department of Chemistry, National University of Singapore, 3 Science Drive 3 117543, Singapore
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Zhang X, Meng W, Liu Y, Dai X, Liu G, Kou L. Magnetic Electrides: High-Throughput Material Screening, Intriguing Properties, and Applications. J Am Chem Soc 2023; 145:5523-5535. [PMID: 36823736 DOI: 10.1021/jacs.3c00284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
Electrides are a unique class of electron-rich materials where excess electrons are localized in interstitial lattice sites as anions, leading to a range of unique properties and applications. While hundreds of electrides have been discovered in recent years, magnetic electrides have received limited attention, with few investigations into their fundamental physics and practical applications. In this work, 51 magnetic electrides (12 antiferromagnetic, 13 ferromagnetic, and 26 interstitial-magnetic) were identified using high-throughput computational screening methods and the latest Materials Project database. Based on their compositions, these magnetic electrides can be classified as magnetic semiconductors, metals, or half-metals, each with unique topological states and excellent catalytic performance for N2 fixation due to their low work functions and excess electrons. The novel properties of magnetic electrides suggest potential applications in spintronics, topological electronics, electron emission, and as high-performance catalysts. This work marks the beginning of a new era in the identification, investigation, and practical applications of magnetic electrides.
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Affiliation(s)
- Xiaoming Zhang
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, China.,School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Weizhen Meng
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, China.,School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Ying Liu
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, China.,School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Xuefang Dai
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, China.,School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Guodong Liu
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, China.,School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Liangzhi Kou
- School of Mechanical, Medical and Process Engineering, Queensland University of Technology, Garden Point Campus, Brisbane 4001, Queensland, Australia
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Yi XW, Liao ZW, You JY, Gu B, Su G. Topological superconductivity and large spin Hall effect in the kagome family Ti 6X 4 (X = Bi, Sb, Pb, Tl, and In). iScience 2022; 26:105813. [PMID: 36619974 PMCID: PMC9817178 DOI: 10.1016/j.isci.2022.105813] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 11/29/2022] [Accepted: 12/12/2022] [Indexed: 12/23/2022] Open
Abstract
Topological superconductors (TSC) become a focus of research due to the accompanying Majorana fermions. However, the reported TSC are extremely rare. Recent experiments reported kagome TSC AV3Sb5 (A = K, Rb, and Cs) exhibit unique superconductivity, topological surface states (TSS), and Majorana bound states. More recently, the first titanium-based kagome superconductor CsTi3Bi5 with nontrivial topology was successfully synthesized as a perspective TSC. Given that Cs contributes little to electronic structures of CsTi3Bi5 and binary compounds may be easier to be synthesized, here, by first-principle calculations, we predict five stable nonmagnetic kagome compounds Ti6X4 (X = Bi, Sb, Pb, Tl, and In) which exhibit superconductivity with critical temperature Tc = 3.8 K - 5.1 K, nontrivial Z 2 band topology, and TSS close to the Fermi level. Additionally, large intrinsic spin Hall effect is obtained in Ti6X4, which is caused by gapped Dirac nodal lines due to a strong spin-orbit coupling. This work offers new platforms for TSC and spintronic devices.
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Affiliation(s)
- Xin-Wei Yi
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zheng-Wei Liao
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jing-Yang You
- Department of Physics, Faculty of Science, National University of Singapore, Singapore 117551, Singapore,Corresponding author
| | - Bo Gu
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China,Kavli Institute for Theoretical Sciences, CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China,Corresponding author
| | - Gang Su
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China,Kavli Institute for Theoretical Sciences, CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China,Corresponding author
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Jansen M, Nuss J, Wedig U. Synergistic Interaction between Attractive d10 Bonding and Localized Excess Electrons, the Cases of Subvalent Ag5SiO4 and Ag5GeO4. Z Anorg Allg Chem 2022. [DOI: 10.1002/zaac.202200269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Martin Jansen
- Max-Planck-Insitut für Festkörperforschung Chemistry III Heisenbergstrasse 1 70569 Stuttgart GERMANY
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Zhang X, Zhao Y, Bergara A, Yang G. Superconducting Li 10Se electride under pressure. J Chem Phys 2022; 156:194112. [PMID: 35597635 DOI: 10.1063/5.0092516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Achieving a compound with interesting multiple coexisting states, such as electride, metallicity, and superconductivity, is of great interest in basic research and practical application. Pressure has become an effective way to realize high-temperature superconductivity in hydrides, whereas most electrides are semiconducting or insulating at high pressure. Here, we have applied swarm-intelligence structural search to identify a hitherto unknown C2/m Li10Se electride that is superconducting at high pressure. More interestingly, Li10Se is estimated to exhibit the highest Tc value of 16 K at 50 GPa, which is the lowest pressure among Li-based chalcogen electrides. This superconducting transition is dominated by Se-related low frequency vibration modes. The increasing electronic occupation of the Se 4d orbital and the decreasing amount of interstitial anion electrons with pressure heighten their coupling with low-frequency phonons, which is responsible for the enhancement of the Tc value. The finding of Li-based chalcogen superconducting electrides provides a reference for the realization of other superconducting electrides at lower pressures.
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Affiliation(s)
- Xiaohua Zhang
- State Key Laboratory of Metastable Materials Science and Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China
| | - Yaping Zhao
- State Key Laboratory of Metastable Materials Science and Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China
| | - Aitor Bergara
- Departamento de Física, Universidad del País Vasco-Euskal Herriko Unibertsitatea, UPV/EHU, 48080 Bilbao, Spain
| | - Guochun Yang
- State Key Laboratory of Metastable Materials Science and Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China
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