Quasiparticle and Spin Dynamics in MnBi2Te4 using time-resolved magneto-optical Kerr spectroscopy.

ORAL

Abstract

Using ultrafast optical spectroscopy, we have investigated quasiparticle and spin dynamics in MnBi2Te4, an intrinsic magnetic topological insulator that exhibits A-type anti-ferromagnetism at TN=24K. The dynamics were measured as a function of temperature and magnetic field using femtosecond optical-pump, near-IR measurements of the reflectivity and magneto-optical Kerr effect (MOKE). The time-resolved MOKE measurements reveal coherent spin precession (~7GHz) in the canted AFM phase which softens with increasing fluence or increasing temperature. In this presentation, we will delineate the field, fluence, and temperature dependence of the long time dynamics in this enigmatic antiferromagnetic topological insulator.

–

Presenters

  • Maxwell Poore

    • University of California, San Diego
    • UC San Diego

Authors

  • Maxwell Poore

    • University of California, San Diego
    • UC San Diego

  • Peter Kim

    • University of California, San Diego
    • UC San Diego

  • Hari Padmanabhan

    • Pennsylvania State University

  • Vladimir A Stoica

    • Pennsylvania State University
    • Argonne National Laboratory
    • Department of Physics, University of Michigan

  • Seng Huat Lee

    • Pennsylvania State University
    • Department of Physics, Pennsylvania State University
    • Physics, The Pennsylvania State University
    • 2D Crystal Consortium, Materials Research Institute, Penn State University
    • Materials Research Institute, Pennsylvania State University

  • Zhiqiang Mao

    • Pennsylvania State University
    • Department of Physics, Penn State University
    • The Pennsylvania State University
    • Penn State University
    • Physics, Penn State University
    • Department of Physics, Pennsylvania State University
    • Department of Physics, The Pennsylvania State University
    • Physics, The Pennsylvania State University
    • Physics, Pennsylvania State University
    • Department of Materials Science and Engineering, Pennsylvania State University

  • Venkatraman Gopalan

    • Pennsylvania State University

  • Richard Averitt

    • University of California, San Diego
    • University of California San Diego
    • UC San Diego
    • Physics, University of California San Diego
    • Department of Physics, University of California, San Diego
    • University of California