Raman signatures on a van der Waals antiferromagnet

ORAL

Abstract

Mixing other exotic properties, such as magnetism or superconductivity, into a topological material has been drawing a lot of researchers’ attention due to its potential as quantum computation and realizing topological phenomena. MnBi2Te4 has been demonstrated to be the first intrinsic antiferromagnetic (AFM) topological insulator (TI) [1]. It consists of Bi2Te3 and Mn-Te bilayer. So far, most studies focused on magnetic properties or electronic structure of the bulk material via magnetic susceptibility, angle-resolved photo-emission spectroscopy, and magnetotransport [2]. When the material comes down to 2D limits, optical Raman spectroscopy becomes advantageous due to its sensitivity and strong layer-dependent characteristic in 2D materials. Raman peaks can also reflect spin interactions that are related to magnetic ordering [3], as well as in-plane magnetic anisotropy. In this project, we will correlate the optical Raman spectrum on MnBi2Te4 with its magnetic transition temperature (~25K) and the in-plane magnetic anisotropy.
[1] Y. Deng et al., arXiv:1904.11468 (2019)
[2] C. Hu et al., arXiv:1905.02154 (2019)
[3] J. -U. Lee et al., Nano Lett. 16, 7433 (2016)

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Presenters

  • Yujin Cho

    • University of California, Los Angeles

Authors

  • Yujin Cho

    • University of California, Los Angeles

  • Subhajit Ghosh

    • University of California, Riverside

  • Zhangji Zhao

    • University of California, Los Angeles

  • Chaowei Hu

    • University of California, Los Angeles
    • Department of Physics and Astronomy, University of California, Los Angeles

  • Jin Ho Kang

    • University of California, Los Angeles

  • Fariborz Kargar

    • University of California, Riverside

  • Ni Ni

    • Univ of California Los Angeles
    • Physics, University of California, Los Angeles
    • Physics and Astronomy, UCLA
    • Department of Physics and Astronomy, University of California Los Angeles
    • University of California, Los Angeles
    • Department of Physics and Astronomy and California NanoSystems Institute, University of California
    • Department of Physics and Astronomy and California Nano Systems Institute, University of California, Los Angeles, CA 90095, USA
    • University of California Los Angeles
    • Department of Physics and Astronomy, University of California, Los Angeles

  • Alexander Balandin

    • University of California, Riverside

  • Chee Wei Wong

    • University of California, Los Angeles
    • Electrical and Computer Engineering, University of California, Los Angeles