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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/117362


    Title: Two-dimensional Topological Crystalline Insulator Phase in Sb/Bi Planar Honeycomb with Tunable Dirac Gap
    Authors: Hsu, Chia-Hsiu;Huang, Zhi-Quan;Crisostomo, Christian P.;Yao, Liang-Zi;Chuang, Feng-Chuan;Liu, Yu-Tzu;Wang, Baokai;Hsu, Chuang-Han;Lee, Chi-Cheng;Lin, Hsin;Bansil, Arun
    Date: 2016-01-14
    Issue Date: 2019-10-10 12:10:43 (UTC+8)
    Publisher: Springer Nature Limited
    Abstract: We predict planar Sb/Bi honeycomb to harbor a two-dimensional (2D) topological crystalline insulator (TCI) phase based on first-principles computations. Although buckled Sb and Bi honeycombs support 2D topological insulator (TI) phases, their structure becomes planar under tensile strain. The planar Sb/Bi honeycomb structure restores the mirror symmetry, and is shown to exhibit non-zero mirror Chern numbers, indicating that the system can host topologically protected edge states. Our computations show that the electronic spectrum of a planar Sb/Bi nanoribbon with armchair or zigzag edges contains two Dirac cones within the band gap and an even number of edge bands crossing the Fermi level. Lattice constant of the planar Sb honeycomb is found to nearly match that of hexagonal-BN. The Sb nanoribbon on hexagonal-BN exhibits gapped edge states, which we show to be tunable by an out-of-the-plane electric field, providing controllable gating of edge state important for device applications.
    Relation: Scientific Reports 6, 18993
    DOI: 10.1038/srep18993
    Appears in Collections:[Graduate Institute & Department of Physics] Journal Article

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