Author(s): Sun, YJ (Sun, Yu-Jia); Lai, JM (Lai, Jia-Min); Pang, SM (Pang, Si-Min); Liu, XL (Liu, Xue-Lu); Tan, PH (Tan, Ping-Heng); Zhang, J (Zhang, Jun)

Source: JOURNAL OF PHYSICAL CHEMISTRY LETTERS Volume: 13 Issue: 6 Pages: 1533-1539 DOI: 10.1021/acs.jpclett.2c00023 Published: FEB 17 2022

Abstract: 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.

Accession Number: WOS:000757522900022

PubMed ID: 35133164

Author Identifiers:

Author Web of Science ResearcherID ORCID Number

TAN, Ping-Heng D-1137-2009 0000-0001-6575-1516

Zhang, Jun 0000-0002-9831-6796

ISSN: 1948-7185

Full Text: https://pubs.acs.org/doi/10.1021/acs.jpclett.2c00023