Contrasting anisotropic electron-phonon-spin coupling in Fe 3 GeTe 2 and Fe 5 GeTe 2: A helicity-resolved Raman study
The study compared electron-phonon-spin coupling in Fe3GeTe2 and Fe5GeTe2 using helicity-resolved Raman spectroscopy. It found that F3GT shows magnetization-mediated anisotropy, while F5GT exhibits static, helicity-symmetric polar responses due to structural differences. This reveals how crystal structure and magnetic order shape coupled electron dynamics.