Nonperturbative Geometric Effects in Laser irradiated 3D Dirac Semimetals

ORAL  · Invited

Abstract

Floquet engineering is a tool to understand and utilize coherent phenomena in quantum materials under laser irradiation [1]. This talk focuses on the Floquet states in 3D Dirac semimetals irradiated by circularly polarized laser fields (CPL). Within the pulse duration, artificial axial gauge fields (also known as chiral gauge fields) are realized [2], while Floquet Weyl points appear in the Floquet spectrum [3]. We will discuss the nonperturbative geometric effects [4,5] in this system and account for the recent ultrafast generation of charge current observed in bismuth.

*JST CREST Grant No. JPMJCR19T3.

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Publication: [1] T. Oka, S. Kitamura, Annual Rev. Cond. Matt. Phys. 10, 387, (2019). [2] S. Ebihara, K. Fukushima, T. Oka, Phys. Rev. B 93, 155107 (2016). [3] L. Bucciantini, S. Roy, S. Kitamura, T. Oka, Phys. Rev. B 96, 041126 (R) (2017). [4] S. Takayoshi, J. Wu, T. Oka, SciPost 11, 075 (2021). [5] T. Oka, Y. Hirai, S. Okumura, N. Yoshikawa, R. Shimano, in preparation.

Presenters

  • Takashi Oka

    • The University of Tokyo
    • Univ. of Tokyo
    • Institute for solid state physics, The University of Tokyo
    • Institute for Solid State Physics, University of Tokyo
    • University of Tokyo

Authors

  • Takashi Oka

    • The University of Tokyo
    • Univ. of Tokyo
    • Institute for solid state physics, The University of Tokyo
    • Institute for Solid State Physics, University of Tokyo
    • University of Tokyo