Layer-dependent phonons in the magnetic topological insulator MnBi<sub>2</sub>Te<sub>4</sub>

ORAL

Abstract

We applied Raman spectroscopy to investigate lattice vibrational modes in the magnetic topological insulator MnBi2Te4 with thicknesses ranging from 1 to 5 septuple layers. We identified the symmetry of phonon modes based on polarization dependent measurements. Also, we observed thickness-dependent phonon modes at frequencies below 12cm-1. Temperature and magnetic field dependent measurements will be also discussed.

*We gratefully acknowledge the support from NSF MRSEC via grant DMR-1720595, NSF CAREER Grant No. DMR-1760668, and NSF DMR-1949701.

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Presenters

  • Jeongheon Choe

    • Department of Physics, Center of Complex Quantum Systems, University of Texas at Austin

Authors

  • Jeongheon Choe

    • Department of Physics, Center of Complex Quantum Systems, University of Texas at Austin

  • David Lujan

    • Department of Physics, University of Texas at Austin
    • Department of Physics, Center of Complex Quantum Systems, University of Texas at Austin
    • University of Texas at Austin

  • Martin Rodriguez-vega

    • Physics, University of Texas at Austin
    • The University of Texas at Austin
    • Center for Dynamics and Control of Materials, University of Texas at Austin
    • University of Texas at Austin

  • Zhipeng Ye

    • Texas Tech University
    • Department of Electrical and Computer Engineering, Texas Tech University

  • Jiamin Quan

    • University of Texas at Austin
    • Department of Physics, The University of Texas at Austin
    • Department of Physics, Center of Complex Quantum Systems, University of Texas at Austin

  • Aritz Leonardo

    • Donostia International Physics Center, Paseo Manuel de Lardizabal 4

  • Timothy Nathan Nunley

    • Department of Physics, University of Texas at Austin
    • Department of Physics, Center of Complex Quantum Systems, University of Texas at Austin

  • Jiaqiang Yan

    • Materials Science and Technology Division, Oak Ridge National Lab
    • Oak Ridge National Laboratory
    • University of Tennessee
    • Oak Ridge National Lab
    • Materials Science and Technology Division, Oak Ridge National Laboratory
    • Materials Science and Technology, Oak Ridge National Laboratory
    • Oak Ridge National Laboratory, Materials Science and Technology Division

  • Gregory Fiete

    • Physics, Northeastern University
    • Northeastern University
    • Physics Department, Northeastern University
    • Department of Physics, Northeastern University

  • Rui He

    • Texas Tech University
    • Department of Electrical and Computer Engineering, Texas Tech University

  • Xiaoqin (Elaine) Li

    • University of Texas at Austin
    • Physics, University of Texas at Austin
    • Department of Physics, University of Texas at Austin
    • U.T. Austin
    • Department of Physics, The University of Texas at Austin
    • Department of Physics, Center of Complex Quantum Systems, University of Texas at Austin