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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