Magnetism-induced Raman modes in two-dimensional CrI<sub>3</sub> atomic layers

POSTER

Abstract

We studied CrI3 atomic layers down to the monolayer limit using temperature and magnetic field dependent micro-Raman spectroscopy. Two sets of Raman modes at frequencies of ~76 and ~125 cm-1 are observed in CrI3 atomic layers only in the antisymmetric channel below the magnetic phase transition temperature, suggesting that these two modes are related to the broken time reversal symmetry in the samples. By tracking the thickness dependence of both modes, we reveal that they are of the surface nature. Magnetic field dependent measurements of bilayer CrI3 at 10 K further show that these modes disappear above the critical field of ~0.8 T. Possible origin of these two Raman modes is proposed.

*Supported by NSF CAREER Grants No. DMR-1760668 and No. DMR-1749774.

Presenters

  • Gaihua Ye

    • Texas Tech University
    • Texas Tech Univ

Authors

  • Gaihua Ye

    • Texas Tech University
    • Texas Tech Univ

  • Zhipeng Ye

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

  • Rui He

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

  • Hyun Ho Kim

    • University of Waterloo, Canada
    • University of Waterloo

  • Bowen Yang

    • University of Waterloo, Canada
    • University of Waterloo

  • Adam Tsen

    • University of Waterloo, Canada
    • University of Waterloo

  • Wencan Jin

    • Auburn University
    • University of Michigan
    • Univ of Michigan - Ann Arbor

  • Siwen Li

    • University of Michigan
    • Univ of Michigan - Ann Arbor

  • Liuyan Zhao

    • Department of Physics, University of Michigan
    • Univ of Michigan - Ann Arbor
    • University of Michigan
    • University of Michigan - Ann Arbor