Dissipative Floquet topological systems

Hossein Dehghani, Takashi Oka, Aditi Mitra

    Research output: Contribution to journalArticle

    Abstract

    Motivated by recent pump-probe spectroscopies, we study the effect of phonon dissipation and potential cooling on the nonequilibrium distribution function in a Floquet topological state. To this end, we apply a Floquet kinetic equation approach to study two-dimensional Dirac fermions irradiated by a circularly polarized laser, a system which is predicted to be in a laser-induced quantum Hall state. We find that the initial electron distribution shows an anisotropy with momentum-dependent spin textures whose properties are controlled by the switching-on protocol of the laser. The phonons then smoothen this out, leading to a nontrivial isotropic nonequilibrium distribution which has no memory of the initial state and initial switch-on protocol, and yet is distinct from a thermal state. An analytical expression for the distribution at the Dirac point is obtained that is relevant for observing quantized transport.

    Original languageEnglish (US)
    Article number195429
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume90
    Issue number19
    DOIs
    StatePublished - Nov 20 2014

    Fingerprint

    Lasers
    lasers
    Fermions
    Phonons
    electron distribution
    kinetic equations
    Distribution functions
    Momentum
    phonons
    Anisotropy
    dissipation
    switches
    textures
    Textures
    fermions
    distribution functions
    Switches
    Pumps
    Spectroscopy
    pumps

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials

    Cite this

    Dissipative Floquet topological systems. / Dehghani, Hossein; Oka, Takashi; Mitra, Aditi.

    In: Physical Review B - Condensed Matter and Materials Physics, Vol. 90, No. 19, 195429, 20.11.2014.

    Research output: Contribution to journalArticle

    Dehghani, Hossein ; Oka, Takashi ; Mitra, Aditi. / Dissipative Floquet topological systems. In: Physical Review B - Condensed Matter and Materials Physics. 2014 ; Vol. 90, No. 19.
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