Quantum Spin Hall Effect in Two-Dimensional Crystals of Transition-Metal Dichalcogenides

被引：144

作者：

Cazalilla, M. A. ^{[1
,2
,3
]}

Ochoa, H. ^{[4
]}

Guinea, F. ^{[4
]}

机构：

[1] Natl Tsing Hua Univ, Dept Phys, Hsinchu, Taiwan

[2] NCTS, Hsinchu, Taiwan

[3] DIPC, San Sebastian 20018, Spain

[4] CSIC, ICMM, E-28049 Madrid, Spain

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 113卷 / 07期

基金：

欧洲研究理事会;

关键词：

DIRAC FERMIONS; MOS2; GRAPHENE; MONOLAYER; STATE;

D O I：

10.1103/PhysRevLett.113.077201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We propose to engineer time-reversal-invariant topological insulators in two-dimensional crystals of transition-metal dichalcogenides (TMDCs). We note that, at low doping, semiconducting TMDCs under shear strain will develop spin-polarized Landau levels residing in different valleys. We argue that gaps between Landau levels in the range of 10-100 K are within experimental reach. In addition, we point out that a superlattice arising from a moire pattern can lead to topologically nontrivial subbands. As a result, the edge transport becomes quantized, which can be probed in multiterminal devices made using strained 2D crystals and/or heterostructures. The strong d character of valence and conduction bands may also allow for the investigation of the effects of electron correlations on the topological phases.

引用

页数：6

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