Affiliation:
1. School of Physics, Southeast University, Nanjing 211189, China
Abstract
Exciton–phonon interactions strongly affect photocarrier dynamics in two-dimensional materials. Here we report on resonant Raman experiments based on a graded composition W xMo1– xS2 alloy with tunable exciton energy without changing the energy of excitation laser. The intensities of the four most pronounced Raman features in the alloy are dramatically enhanced due to the resonance derived from the energy of B exciton shifting to the vicinity of the energy of excitation laser with an increase in W composition x. Specifically, through the resonance peak shift, absorption spectra and PL emission spectra under different excitation power, we conclude the resonance Raman is related to the exciton emission process. Our study extends the resonant Raman study of two-dimensional materials, which is expected to obtain deeper understanding of the excitonic effects in two-dimensional semiconductor materials.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Strategic Priority Research Program of Chinese Academy of Sciences
Subject
Physics and Astronomy (miscellaneous)
Cited by
2 articles.
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