Magnetic photocurrent in even-layered topological antiferromagnet MnBi<sub>2</sub>Te<sub>4</sub>

ORAL

Abstract

MnBi2Te4 is a magnetic topological insulator that holds rich physical properties down to their 2D limit. Each septuple layer consists of a Bi2Te3 layer and a MnTe layer, which give rise to its topology and pristine magnetism, respectively. Moreover, as the magnetic moments couple antiferromagnetically between adjacent septuple layers, the spin texture breaks the inversion symmetry of even-layered MnBi2Te4 and leads to magnetic photocurrents that have been rarely studied before. In this talk, I will present our experimental study of the optoelectronic responses in even-layered MnBi2Te4. We observe an intrinsic photocurrent that can be controlled by external electrical and magnetic fields. I will also discuss how the magnetic photocurrent could also decode MnBi2Te4’s quantum geometrical structures.

*This work is supported as part of the Center for the Advancement of Topological Materials, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science.

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Presenters

  • Zumeng Huang

    • Boston College

Authors

  • Zumeng Huang

    • Boston College

  • Zhe Sun

    • Boston College
    • Boston College and Harvard University

  • Anyuan Gao

    • Harvard University

  • Tiema Qian

    • University of California, Los Angeles

  • Siyuan Ding

    • Boston College
    • Department of Physics, Boston College

  • Jian Tang

    • Boston College

  • Kenji Watanabe

    • National Institute for Materials Science
    • Research Center for Functional Materials, National Institute of Materials Science
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan
    • NIMS
    • Research Center for Functional Materials, National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Japan
    • NIMS Japan

  • Takashi Taniguchi

    • National Institute for Materials Science
    • Kyoto Univ
    • International Center for Materials Nanoarchitectonics, National Institute of Materials Science
    • Kyoto University
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • National Institute For Materials Science
    • NIMS
    • National Institute for Material Science
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Japan
    • NIMS Japan

  • Ni Ni

    • University of California, Los Angeles
    • University of California, Los Angeles, Los Angeles

  • Suyang Xu

    • Harvard University

  • Qiong Ma

    • Boston College