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    Exotic topological insulator states and topological phase transitions in Sb2Se3-Bi2Se3 heterostructures

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    Type
    Article
    Authors
    Zhang, Qianfan
    Zhang, Zhiyong
    Zhu, Zhiyong
    Schwingenschlögl, Udo cc
    Cui, Yi cc
    KAUST Department
    Computational Physics and Materials Science (CPMS)
    Core Labs
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    KUS-I1-001-12
    Date
    2012-02-27
    Online Publication Date
    2012-02-27
    Print Publication Date
    2012-03-27
    Permanent link to this record
    http://hdl.handle.net/10754/562135
    
    Metadata
    Show full item record
    Abstract
    Topological insulator is a new state of matter attracting tremendous interest due to its gapless linear dispersion and spin momentum locking topological states located near the surface. Heterostructures, which have traditionally been powerful in controlling the electronic properties of semiconductor devices, are interesting for topological insulators. Here, we studied the spatial distribution of the topological state in Sb 2Se 3-Bi 2Se 3 heterostructures by first-principle simulation and discovered that an exotic topological state exists. Surprisingly, the state migrates from the nontrivial Bi 2Se 3 into the trivial Sb 2Se 3 region and spreads across the entire Sb 2Se 3 slab, extending beyond the concept of "surface" state while preserving all of the topological surface state characteristics. This unusual topological state arises from the coupling between different materials and the modification of electronic structure near Fermi energy. Our study demonstrates that heterostructures can open up opportunities for controlling the real-space distribution of the topological state and inducing quantum phase transitions between topologically trivial and nontrivial states. © 2012 American Chemical Society.
    Citation
    Zhang, Q., Zhang, Z., Zhu, Z., Schwingenschlögl, U., & Cui, Y. (2012). Exotic Topological Insulator States and Topological Phase Transitions in Sb2Se3–Bi2Se3 Heterostructures. ACS Nano, 6(3), 2345–2352. doi:10.1021/nn2045328
    Sponsors
    Y.C. acknowledges the support from the Keck Foundation, DARPA MESO project (No. N66001-11-1-4105) and King Abdullah University of Science and Technology (KAUST) Investigator Award (No. KUS-I1-001-12). The authors acknowledge the National Energy Research Scientific Computing Center (NERSC) and KAUST for computer time. Z.Z. acknowledges partial support from National Nanotechnology Infrastructure Network (NNIN).
    Publisher
    American Chemical Society (ACS)
    Journal
    ACS Nano
    DOI
    10.1021/nn2045328
    ae974a485f413a2113503eed53cd6c53
    10.1021/nn2045328
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; Computational Physics and Materials Science (CPMS)

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