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    Unconventional quantum Hall effect in Floquet topological insulators

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    Type
    Article
    Authors
    Tahir, M.
    Vasilopoulos, P.
    Schwingenschlögl, Udo cc
    KAUST Department
    Computational Physics and Materials Science (CPMS)
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2016-07-27
    Online Publication Date
    2016-07-27
    Print Publication Date
    2016-09-28
    Permanent link to this record
    http://hdl.handle.net/10754/622491
    
    Metadata
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    Abstract
    We study an unconventional quantum Hall effect for the surface states of ultrathin Floquet topological insulators in a perpendicular magnetic field. The resulting band structure is modified by photon dressing and the topological property is governed by the low-energy dynamics of a single surface. An exchange of symmetric and antisymmetric surface states occurs by reversing the lights polarization. We find a novel quantum Hall state in which the zeroth Landau level undergoes a phase transition from a trivial insulator state, with Hall conductivity αyx = 0 at zero Fermi energy, to a Hall insulator state with αyx = e2/2h. These findings open new possibilities for experimentally realizing nontrivial quantum states and unusual quantum Hall plateaus at (±1/2,±3/2,±5/2, ...)e2/h. © 2016 IOP Publishing Ltd Printed in the UK.
    Citation
    Tahir M, Vasilopoulos P, Schwingenschlögl U (2016) Unconventional quantum Hall effect in Floquet topological insulators. Journal of Physics: Condensed Matter 28: 385302. Available: http://dx.doi.org/10.1088/0953-8984/28/38/385302.
    Sponsors
    This work was supported by the Canadian NSERC Grant No. OGP0121756 (MT, PV). The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST) (US).
    Publisher
    IOP Publishing
    Journal
    Journal of Physics: Condensed Matter
    DOI
    10.1088/0953-8984/28/38/385302
    Additional Links
    http://iopscience.iop.org/article/10.1088/0953-8984/28/38/385302/meta
    ae974a485f413a2113503eed53cd6c53
    10.1088/0953-8984/28/38/385302
    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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