Tunable Floquet-Bloch manipulation of surface states in the antiferromagnetic topological insulator MnBi<sub>2</sub>Te<sub>4</sub>

ORAL

Abstract

The Floquet-Bloch manipulation of materials using the time-periodic potential of a laser pulse is a promising route to generate and coherently control new phases of matter. So far, experimental realization has been limited to the manipulation of time-reversal symmetric and non-interacting systems such as graphene and the surface states of a 3D topological insulator. In this work, we realize Floquet-Bloch manipulation of a time-reversal broken system: the putative antiferromagnetic topological insulator MnBi2Te4. Using time- and angle-resolved photoemission spectroscopy (tr-ARPES) with a mid-infrared pump, we generate Floquet-Bloch sidebands and demonstrate a gap opening at the Dirac point with circularly polarized light. Combined with Floquet theory calculations, our results uncover a rich, tunable Floquet phase diagram that uniquely arises in MnBi2Te4 due to the intrinsically broken time-reversal symmetry and the coherent dressing of an unequal number of particle- and hole-like bands.

*This work was supported by the Quantum Sensing and Quantum Materials, an Energy Frontier Research Center funded by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), under Award No.DE-SC0021238.

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Presenters

  • Nina Bielinski

    • University of Illinois at Urbana-Champaign

Authors

  • Nina Bielinski

    • University of Illinois at Urbana-Champaign

  • Rajas Chari

    • University of Illinois at Urbana-Champaign

  • Julian May-Mann

    • University of Illinois at Urbana-Champai
    • University of Illinois at Urbana-Champaign

  • Soyeun Kim

    • University of Illinois at Urbana-Champai
    • Stanford University

  • Yujun Deng

    • Stanford University, SLAC - Natl Accelerator Lab

  • Anuva Aishwarya

    • University of Illinois at Urbana Champaign

  • Chandra Shekhar

    • Max Planck Institute for Chemical Physics of Solids

  • Makoto Hashimoto

    • SLAC - Natl Accelerator Lab

  • Donghui Lu

    • SLAC - Natl Accelerator Lab

  • Jiaqiang Yan

    • Oak Ridge National Laboratory
    • Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA

  • Claudia Felser

    • Max Planck Institute for Chemical Physic
    • Max Planck Institute for Chemical Physics of Solids

  • Vidya Madhavan

    • University of Illinois at Urbana-Champaign
    • University of Illinois Urbana-Champaign

  • Zhixun Shen

    • Stanford University
    • Stanford Insitute for Materials and Energy Sciences
    • Stanford

  • Taylor Hughes

    • University of Illinois at Urbana-Champaign

  • Fahad Mahmood

    • UIUC
    • University of Illinois Urbana-Champaign
    • University of Illinois at Urbana-Champaign
    • University of Illinois Urbana Champaign
    • University of Illinois