[15p-K506-1~19] 3.11 Nanoscale optical science and near-field optics

5:30 PM - 5:45 PM JST(8:30 AM - 8:45 AM UTC)

[15p-K506-16] Local infrared dynamics in CVD-grown WS₂ monolayers

〇Jun Nishida^1,2, Yu Wang¹, Xu Yang³, Yoshiki Sakuma³, Takashi Kumagai^1,2 (1.IMS, 2.SOKENDAI, 3.NIMS)

Keywords:

Ultrafast nano-imaging,Low-dimensional materials,Infrared scattering scanning near-field optical microscopy

Due to their low-dimensional nature, photoinduced electron-hole pairs in monolayer transition metal dichalcogenides (TMDCs) are highly susceptible to defects and many-body interactions. In particular, TMDC monolayers synthesized via chemical vapor deposition (CVD) typically exhibit a relatively high density of inhomogeneously distributed defects. In this study, we visualize local photoinduced dynamics in a CVD-grown WS₂ monolayer using ultrafast infrared scattering-type scanning near-field optical microscopy (ultrafast s-SNOM). Our results reveal that this dynamical heterogeneity is responsible for the spatial modulation observed in the optoelectronic response of the material.