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  Proximity enhanced quantum spin Hall state in graphene

Kou, L., Hu, F., Yan, B., Wehling, T., Felser, C., Frauenheim, T., et al. (2015). Proximity enhanced quantum spin Hall state in graphene. Carbon, 87, 418-423. doi:10.1016/j.carbon.2015.02.057.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0026-CAD7-D Version Permalink: http://hdl.handle.net/21.11116/0000-0001-0016-6
Genre: Journal Article

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 Creators:
Kou, Liangzhi1, Author
Hu, Feiming1, Author
Yan, Binghai2, Author              
Wehling, Tim1, Author
Felser, Claudia3, Author              
Frauenheim, Thomas1, Author
Chen, Changfeng1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Binghai Yan, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863427              
3Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 Abstract: Graphene is the first model system of two-dimensional topological insulator (TI), also known as quantum spin Hall (QSH) insulator. The QSH effect in graphene, however, has eluded direct experimental detection because of its extremely small energy gap due to the weak spin-orbit coupling. Here we predict by ab initio calculations a giant (three orders of magnitude) proximity induced enhancement of the TI energy gap in the graphene layer that is sandwiched between thin slabs of Sb2Te3 (or MoTe2). This gap (1.5 meV) is accessible by existing experimental techniques, and it can be further enhanced by tuning the interlayer distance via compression. We reveal by a tight-binding study that the QSH state in graphene is driven by the Kane-Mele interaction in competition with Kekule deformation and symmetry breaking. The present work identifies a new family of graphene-based TIs with an observable and controllable bulk energy gap in the graphene layer, thus opening a new avenue for direct verification and exploration of the long-sought QSH effect in graphene. (C) 2015 Elsevier Ltd. All rights reserved.

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 Dates: 2015-05-112015-05-11
 Publication Status: Published in print
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Title: Carbon
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 87 Sequence Number: - Start / End Page: 418 - 423 Identifier: Other: 0008-6223
CoNE: /journals/resource/954925388220