Discovery of Two-Dimensional Quantum Spin Hall Effect in Triangular Transition-Metal Carbides
Shou-juan Zhang1 , Wei-xiao Ji1 , Chang-wen Zhang1** , Shu-feng Zhang1 , Ping Li1 , Sheng-shi Li2 , Shi-shen Yan2**
1 School of Physics and Technology, University of Jinan, Jinan 2500222 School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100
Abstract ：Though the quantum spin Hall effect (QSHE) in two-dimensional (2D) crystals has been widely explored, the experimental realization of quantum transport properties is only limited to HgTe/CdTe or InAs/GaSb quantum wells. Here we employ a tight-binding model on the basis of $d_{z^{2}}$, $d_{xy}$, and $d_{x^{2}-y^{2}}$ orbitals to propose QSHE in the triangular lattice, which are driven by a crossing of electronic bands at the ${\it \Gamma}$ point. Remarkably, 2D oxidized Mxenes W$_{2}$M$_{2}$C$_{3}$ are ideal materials with nontrivial gap of 0.12 eV, facilitating room-temperature observations in experiments. We also find that the nontrivially topological properties of these materials are sensitive to the cooperative effect of the electron correlation and spin-orbit coupling. Due to the feasible exfoliation from its 3D MAX phase, our work paves a new direction towards realizing QSHE with low dissipation.
收稿日期: 2018-02-04
出版日期: 2018-07-15
:
73.43.-f
(Quantum Hall effects)
73.43.Nq
(Quantum phase transitions)
73.20.At
(Surface states, band structure, electron density of states)
引用本文:
. [J]. 中国物理快报, 2018, 35(8): 87303-.
链接本文:
https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/35/8/087303
或
https://cpl.iphy.ac.cn/CN/Y2018/V35/I8/87303
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2018, Vol. 35 
