Anomalous Interference of Floquet-Bloch States in the Magnetic Topological Insulator MnBi<sub>2</sub>Te<sub>4</sub>

ORAL

Abstract

The coherent optical manipulation of solids via Floquet engineering has emerged as a promising way to understand non-equilibrium physics and generate novel quantum phases of matter. So far, Floquet engineering of materials has been limited to Dirac materials without strong correlations. Here we use time- and angle-resolved photoemission spectroscopy (tr-ARPES) with mid-IR pump pulses to observe Floquet-Bloch states in the intrinsic antiferromagnetic topological insulator MnBi2Te4. This system is an ideal candidate for studying Floquet phenomena in the presence of both magnetic correlations and topology. We observe an anomalous interference between certain Floquet-Bloch states which is distinct from the well characterized Floquet-Bloch response of the 3D topological insulator Bi2Se3. We will discuss this observation in relation to the intrinsic antiferromagnetic ordering and topological character of MnBi2Te4.  

**This work is supported by the Illinois Materials Research Science and Engineering Centers (MRSEC) award number DMR-1720633 and through the Illinois Materials Research Lab (MRL) facilities.

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Presenters

  • Nina Bielinski

    • University of Illinois at Urbana-Champaign

Authors

  • Nina Bielinski

    • University of Illinois at Urbana-Champaign

  • Soyeun Kim

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

  • Chandra Shekhar

    • Max Planck Institute for Chemical Physics of Solids

  • Anuva Aishwarya

    • Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, USA
    • University of Illinois at Urbana-Champaign

  • Vidya Madhavan

    • University of Illinois at Urbana-Champaign
    • Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, USA

  • Claudia Felser

    • Max Planck Institute for Chemical Physic
    • Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
    • Max Planck Institute for Chemical Physics of Solids

  • Fahad Mahmood

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