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Engineering a robust quantum spin Hall state in graphene via adatom deposition

Weeks, Conan and Hu, Jun and Alicea, Jason and Franz, Marcel and Wu, Ruqian (2011) Engineering a robust quantum spin Hall state in graphene via adatom deposition. . (Unpublished)

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The 2007 discovery of quantized conductance in HgTe quantum wells delivered the field of topological insulators (TIs) its first experimental confirmation. While many three-dimensional TIs have since been identified, HgTe remains the only known two-dimensional system in this class. Difficulty fabricating HgTe quantum wells has, moreover, hampered their widespread use. With the goal of breaking this logjam we provide a blueprint for stabilizing a robust TI state in a more readily available two-dimensional material---graphene. Using symmetry arguments, density functional theory, and tight-binding simulations, we predict that graphene endowed with certain heavy adatoms realizes a TI with substantial band gap. For indium and thallium, our most promising adatom candidates, a modest 6% coverage produces an estimated gap near 80K and 240K, respectively, which should be detectable in transport or spectroscopic measurements. Engineering such a robust topological phase in graphene could pave the way for a new generation of devices for spintronics, ultra-low-dissipation electronics and quantum information processing.

Item Type:Report or Paper (Discussion Paper)
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URLURL TypeDescription Paper
Alicea, Jason0000-0001-9979-3423
Additional Information:It is a pleasure to acknowledge helpful discussions with Jim Eisenstein, Ilya Elfimov, Josh Folk, Erik Henriksen, Roland Kawakami, Shu-Ping Lee, Gil Refael, Shan-Wen Tsai, and Amir Yacoby. J.A. gratefully acknowledges support from the National Science Foundation through grant DMR-1055522. Work at UBC was supported by NSERC and CIfAR.
Funding AgencyGrant Number
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Canadian Institute for Advanced Research (CIFAR)UNSPECIFIED
Record Number:CaltechAUTHORS:20200225-105137997
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:101533
Deposited By: George Porter
Deposited On:25 Feb 2020 19:04
Last Modified:09 Mar 2020 13:18

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