4.8 Article

Magneto-Raman Study of Magnon-Phonon Coupling in Two-Dimensional Ising Antiferromagnetic FePS3

期刊

JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 13, 期 6, 页码 1533-1539

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.2c00023

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资金

  1. National Key Research and Development Program of China [2017YFA0303401]
  2. CAS Interdisciplinary Innovation Team
  3. National Natural Science Foundation of China [12074371]
  4. Strategic Priority Research Program of Chinese Academy of Sciences [XDB28000000]

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By utilizing near-resonant magneto-Raman spectroscopy, the magnon-phonon coupling in FePS3 is investigated under a relatively small magnetic field. The results show the coupling effects between magnons and phonons, including frequency anti-crossing coupling and polarization transferring between coupled modes.
Recently, the coupling between magnons (quanta of spin waves) and phonons (quanta of lattice vibrations) in two-dimensional (2D) antiferromagnet FePS3 offers a myriad of applications ranging from spintronic devices to quantum information technologies. However, the reported magnon-phonon coupling in the FePS3 flake using Raman measurements requires an ultrahigh magnetic field up to 30 T. Here, we investigate the magnon-phonon coupling in FePS3 by near-resonant magneto-Raman spectroscopy under a relatively small magnetic field (|H-0| <= 9 T). Under near-resonant excitation, we find more pronounced coupling effects that are absent in non-resonant excitation: three optical phonons sensitive to the applied magnetic field are resolved, two of which show a frequency anti-crossing coupling with magnon, while the other coupled phonon exhibits only a polarization-coupled character without frequency anti-crossing. Besides, our polarized Raman results also show the polarization transferring between coupled magnon-phonon modes. On the basis of a modified theoretical model, we can well explain the measured Raman spectra.

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