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Two-dimensional MX dirac materials and quantum spin Hall insulators with tunable electronic and topological properties

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Nano Research 2021年第3期14卷 584-589页

作者： Yan-Fang Zhang Jinbo Pan Huta Banjade Jie Yu Hsin Lin Arun Bansil Shixuan Du Qimin Yan Institute of Physics&University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing100190China Department of Physics Temple UniversityPhiladelphiaPA19122USA Institute of Physics “Academia Sinica”Taipei11529Taiwan Physics Department Northeastern UniversityBostonMA02115USA

We propose a novel class of two-dimensional(2D)dirac materials in the MX family(M=Be,Mg,Zn and Cd,X=Cl,Br and I),which exhibit graphene-like band structures with linearly-dispersing dirac-cone states over large energy scales(0.8–1.8 eV)and ultra-high Fermi velocities comparable to ***-orbit coupling opens sizable topological band gaps so that these compounds can be effectively classified as quantum spin Hall *** electronic and topological properties are found to be highly tunable and amenable to modulation via anion-layer substitution and vertical electric *** structures of several members of the family are shown to host a Van-Hove singularity(VHS)close to the energy of the dirac *** enhanced density-of-states associated with these VHSs could provide a mechanism for inducing topological *** presence of sizable band gaps,ultra-high carrier mobilities,and small effective masses makes the MX family promising for electronics and spintronics applications.

关键词： two-dimensional dirac materials density functional theory topological properties

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The rare two-dimensional materials with dirac cones

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National Science Review 2015年第1期2卷 22-39页

作者： Jinying Wang Shibin Deng Zhongfan Liu Zhirong Liu Center for Nanochemstry Colledge of Chemistry and Molecular EngineeringPeking University

Inspired by the great development of graphene, more and more research has been conducted to seek new two-dimensional(2D) materials with dirac cones. Although 2D dirac materials possess many novel properties and physics, they are rare compared with the numerous 2D materials. To provide explanation for the rarity of 2D dirac materials as well as clues in searching for new dirac systems, here we review the recent theoretical aspects of various 2D dirac materials, including graphene, silicene, germanene,graphynes, several boron and carbon sheets, transition-metal oxides(VO2)n/(TiO2)m and(CrO2)n/(TiO2)m, organic and organometallic crystals, so-MoS2, and artiicial latices(electron gases and ultracold atoms). heir structural and electronic properties are summarized. We also investigate how dirac points emerge, move, and merge in these systems. he von Neumann–Wigner theorem is used to explain the scarcity of dirac cones in 2D systems, which leads to rigorous requirements on the symmetry,parameters, Fermi level, and band overlap of materials to achieve dirac cones. Connections between existence of dirac cones and the structural features are also discussed.

关键词： graphene silicene graphyne two-dimensional dirac cone dirac materials

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Log-periodic quantum magneto-oscillations and discrete-scale invariance in topological material HfTe5

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National Science Review 2019年第5期6卷 914-920页

作者： Huichao Wang Yanzhao Liu Yongjie Liu Chuanying Xi Junfeng Wang Jun Liu Yong Wang Liang Li Shu Ping Lau Mingliang Tian Jiaqiang Yan David Mandrus Ji-Yan Dai Haiwen Liu Xincheng Xie Jian Wang International Center for Quantum materials School of Physics Peking University Department of Applied Physics The Hong Kong Polytechnic University Wuhan National High Magnetic Field Center Huazhong University of Science and Technology High Magnetic Field Laboratory Chinese Academy of Sciences Center of Electron Microscopy State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University materials Science and Technology Division Oak Ridge National Laboratory Department of materials Science and Engineering University of Tennessee Center for Advanced Quantum Studies Department of PhysicsBeijing Normal University Collaborative Innovation Center of Quantum Matter CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing Academy of Quantum Information Sciences

Discrete-scale invariance（DSI） is a phenomenon featuring intriguing log-periodicity that can be rarely observed in quantum ***, we report the log-periodic quantum oscillations in the longitudinal magnetoresistivity(ρ;) and the Hall traces(ρ;) of Hf Te5 crystals, which reveal the DSI in the transport-coefficients *** oscillations in ρ;and ρ;show the consistent log B-periodicity with a phase *** finding of the log B oscillations in the Hall resistance supports the physical mechanism as a general quantum effect originating from the resonant *** with theoretical simulations, we further clarify the origin of the log-periodic oscillations and the DSI in the topological *** work evidences the universality of the DSI in the dirac materials and provides indispensable information for a full understanding of this novel phenomenon.

关键词： log-periodic oscillations discrete-scale invariance topological materials dirac materials magnetoresistance Hall resistance

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