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Theory of Floquet band formation and local pseudospin textures in pump-probe photoemission of graphene

Author

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  • M.A. Sentef

    (Stanford Institute for Materials and Energy Sciences (SIMES), Stanford University and SLAC National Accelerator Laboratory
    HISKP University of Bonn)

  • M. Claassen

    (Geballe Laboratory for Advanced Materials, Stanford University)

  • A.F. Kemper

    (Lawrence Berkeley National Lab)

  • B. Moritz

    (Stanford Institute for Materials and Energy Sciences (SIMES), Stanford University and SLAC National Accelerator Laboratory
    University of North Dakota)

  • T. Oka

    (University of Tokyo)

  • J.K. Freericks

    (Georgetown University)

  • T.P. Devereaux

    (Stanford Institute for Materials and Energy Sciences (SIMES), Stanford University and SLAC National Accelerator Laboratory
    Geballe Laboratory for Advanced Materials, Stanford University)

Abstract

Ultrafast materials science promises optical control of physical properties of solids. Continuous-wave circularly polarized laser driving was predicted to induce a light-matter coupled state with an energy gap and a quantum Hall effect, coined Floquet topological insulator. Whereas the envisioned Floquet topological insulator requires high-frequency pumping to obtain well-separated Floquet bands, a follow-up question regards the creation of Floquet-like states in graphene with realistic low-frequency laser pulses. Here we predict that short optical pulses attainable in experiments can lead to local spectral gaps and novel pseudospin textures in graphene. Pump-probe photoemission spectroscopy can track these states by measuring sizeable energy gaps and Floquet band formation on femtosecond time scales. Analysing band crossings and pseudospin textures near the Dirac points, we identify new states with optically induced nontrivial changes of sublattice mixing that leads to Berry curvature corrections of electrical transport and magnetization.

Suggested Citation

  • M.A. Sentef & M. Claassen & A.F. Kemper & B. Moritz & T. Oka & J.K. Freericks & T.P. Devereaux, 2015. "Theory of Floquet band formation and local pseudospin textures in pump-probe photoemission of graphene," Nature Communications, Nature, vol. 6(1), pages 1-8, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8047
    DOI: 10.1038/ncomms8047
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    Cited by:

    1. Matteo Lucchini & Fabio Medeghini & Yingxuan Wu & Federico Vismarra & Rocío Borrego-Varillas & Aurora Crego & Fabio Frassetto & Luca Poletto & Shunsuke A. Sato & Hannes Hübener & Umberto Giovannini & , 2022. "Controlling Floquet states on ultrashort time scales," Nature Communications, Nature, vol. 13(1), pages 1-7, December.

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