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

AuthorsCazalilla, M. A; Ochoa, Héctor; Guinea, F.
Issue Date15-Aug-2014
PublisherAmerican Physical Society
CitationPhysical Review Letters 113(7): 077201 (2014)
AbstractWe 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.
Publisher version (URL)https://doi.org/10.1103/PhysRevLett.113.077201
Identifiersdoi: 10.1103/PhysRevLett.113.077201
issn: 0031-9007
e-issn: 1079-7114
Appears in Collections:(ICMM) Artículos
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