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

共 60 条

[51] Gauge fields in graphene [J].

Vozmediano, M. A. H. ;

Katsnelson, M. I. ;

Guinea, F. .

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 2010, 496 (4-5) :109-148

[52] Generic miniband structure of graphene on a hexagonal substrate [J].

Wallbank, J. R. ;

Patel, A. A. ;

Mucha-Kruczynski, M. ;

Geim, A. K. ;

Falko, V. I. .

PHYSICAL REVIEW B, 2013, 87 (24)

[53]

Wang QH, 2012, NAT NANOTECHNOL, V7, P699, DOI [10.1038/nnano.2012.193, 10.1038/NNANO.2012.193]

[54] Engineering a Robust Quantum Spin Hall State in Graphene via Adatom Deposition [J].

Weeks, Conan ;

Hu, Jun ;

Alicea, Jason ;

Franz, Marcel ;

Wu, Ruqian .

PHYSICAL REVIEW X, 2011, 1 (02) :1-15

[55] Coupled Spin and Valley Physics in Monolayers of MoS2 and Other Group-VI Dichalcogenides [J].

Xiao, Di ;

Liu, Gui-Bin ;

Feng, Wanxiang ;

Xu, Xiaodong ;

Yao, Wang .

PHYSICAL REVIEW LETTERS, 2012, 108 (19)

[56] Stability of the quantum spin Hall effect:: Effects of interactions, disorder, and Z2 topology -: art. no. 045322 [J].

Xu, CK ;

Moore, JE .

PHYSICAL REVIEW B, 2006, 73 (04)

[57]

Xu G., ARXIV13085664

[58]

Yankowitz M, 2012, NAT PHYS, V8, P382, DOI [10.1038/nphys2272, 10.1038/NPHYS2272]

[59] Magnetic molybdenum disulfide nanosheet films [J].

Zhang, Jia ;

Soon, Jia Mei ;

Loh, Kian Ping ;

Yin, Jianhua ;

Ding, Jun ;

Sullivian, Michael B. ;

Wu, Ping .

NANO LETTERS, 2007, 7 (08) :2370-2376

[60] Giant valley drifts in uniaxially strained monolayer MoS2 [J].

Zhang, Qingyun ;

Cheng, Yingchun ;

Gan, Li-Yong ;

Schwingenschloegl, Udo .

PHYSICAL REVIEW B, 2013, 88 (24)

← 1 2 3 4 5 6 →