Nonequilibrium susceptibility in photoinduced Floquet states

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Abstract

Nonequilibrium susceptibility in photoinduced Floquet states is studied. We analyze an electron system coupled with a heat bath in a time-periodic electric field. Spin/charge susceptibility is formulated on the basis of the Floquet Green's function method, and is calculated numerically in a wide range of amplitude and frequency of light. When the frequency is larger than the bandwidth, the susceptibility is enhanced due to the dynamical localization effect, and their peak positions in the momentum space are shifted by the Fermi surface deformation. In the case of the small frequency and amplitude, a multiple-peak structure emerges in the susceptibility, originating from the multiple Floquet bands which cross the Fermi level of the bath. To confirm those numerical results and provide the interpretation, a perturbative expression of the susceptibility is derived for small electric-field amplitude.

Original languageEnglish
Article number075127
JournalPhysical Review B
Volume100
Issue number7
DOIs
Publication statusPublished - 2019 Aug 13

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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