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Electrically tunable band gap in silicene

Drummond, Neil and Zolyomi, Viktor and Falko, Vladimir (2012) Electrically tunable band gap in silicene. Physical Review B, 85 (7). ISSN 1550-235X

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    Abstract

    We report calculations of the electronic structure of silicene and the stability of its weakly buckled honeycomb lattice in an external electric field oriented perpendicular to the monolayer of Si atoms. The electric field produces a tunable band gap in the Dirac-type electronic spectrum, the gap being suppressed by a factor of about eight by the high polarizability of the system. At low electric fields, the interplay between this tunable band gap, which is specific to electrons on a honeycomb lattice, and the Kane-Mele spin-orbit coupling induces a transition from a topological to a band insulator, whereas at much higher electric fields silicene becomes a semimetal.

    Item Type: Article
    Journal or Publication Title: Physical Review B
    Additional Information: ©2012 American Physical Society
    Subjects: Q Science > QC Physics
    Departments:
    ID Code: 53305
    Deposited By: ep_importer_pure
    Deposited On: 21 Mar 2012 09:25
    Refereed?: Yes
    Published?: Published
    Last Modified: 23 Jul 2014 14:58
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/53305

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