Unconventional quantum Hall effect in Floquet topological insulators

M. Tahir, P. Vasilopoulos, Udo Schwingenschlögl

Research output: Contribution to journalArticlepeer-review

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.
Original languageEnglish (US)
Pages (from-to)385302
JournalJournal of Physics: Condensed Matter
Volume28
Issue number38
DOIs
StatePublished - Jul 27 2016

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