Plasmonic Effect on the Magneto-Optical Property of Monolayer WS₂ Studied by Polarized-Raman Spectroscopy

In recent years, the magneto-optical properties of two-dimensional transition metal disulfides have attracted more and more attention due to their further device applications in spintronics and valleytronics. However, to our knowledge, the plasmonic effect on the magneto-optical properties of WS₂ has not been studied. In this work, monolayer WS₂ transferred on SiO₂/Si substrate and Au film were investigated respectively using polarized-Raman spectroscopy at 4 K under different magnetic fields. Prominent magnetic field–induced variations in the Raman intensities of WS₂ samples were observed, which also exhibited significant differences in the spectral evolution versus magnetic field. The resonance magnetic field was 5 T and 5.5 T for the WS₂ on SiO₂/Si substrate and Au film, respectively. Remarkably, the magneto-optical Raman intensities of (Formula presented.) and 2LA(M) modes for WS₂ on Au film were reduced to approximately 60% compared with that of WS₂ on SiO₂/Si. These results suggest that the plasmonic effect–induced charge transfer plays an important role in the magneto-optical Raman effect of WS₂.