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Research Article

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

Yan-Fang Zhang1,2,§, Jinbo Pan2,†,§, Huta Banjade2, Jie Yu2, Hsin Lin3, Arun Bansil4, Shixuan Du1( ), Qimin Yan2( )
Institute of Physics & University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China
Department of Physics, Temple University, Philadelphia, PA 19122, USA
Institute of Physics, "Academia Sinica", Taipei 11529, Taiwan, China
Physics Department, Northeastern University, Boston, MA 02115, USA

§ Yan-Fang Zhang and Jinbo Pan contributed equally to this work.

† Present address: Institute of Physics & University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China

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Graphical Abstract

Abstract

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 graphene. Spin-orbit coupling opens sizable topological band gaps so that these compounds can be effectively classified as quantum spin Hall insulators. The electronic and topological properties are found to be highly tunable and amenable to modulation via anion-layer substitution and vertical electric field. Electronic structures of several members of the family are shown to host a Van-Hove singularity (VHS) close to the energy of the Dirac node. The enhanced density-of-states associated with these VHSs could provide a mechanism for inducing topological superconductivity. The presence of sizable band gaps, ultra-high carrier mobilities, and small effective masses makes the MX family promising for electronics and spintronics applications.

Keywords

two-dimensionalDirac materialsdensity functional theorytopological properties

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Nano Research
Volume 14 Issue 3,
March 2021
Pages 584-589
DOI: 10.1007/s12274-020-3022-3
Cite this article:
Zhang Y-F, Pan J, Banjade H, et al. Two-dimensional MX Dirac materials and quantum spin Hall insulators with tunable electronic and topological properties. Nano Research, 2021, 14(3): 584-589. https://doi.org/10.1007/s12274-020-3022-3
Topics:
Electric fields Electronic structureEnergy gapGrapheneSpin orbit couplingTopology

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Received: 12 June 2020
Revised: 28 July 2020
Accepted: 29 July 2020
Published: 01 March 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature
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