Light-matter interactions in two-dimensional layered WSe₂ for gauging evolution of phonon dynamics.

ABSTRACT: Phonon dynamics is explored in mechanically exfoliated two-dimensional WSe₂ using temperature-dependent and laser-power-dependent Raman and photoluminescence (PL) spectroscopy. From this analysis, phonon lifetime in the Raman active modes and phonon concentration, as correlated to the energy parameter E ₀, were calculated as a function of the laser power, P, and substrate temperature, T. For monolayer WSe₂, from the power dependence it was determined that the phonon lifetime for the in-plane vibrational mode was twice that of the out-of-plane vibrational mode for P in the range from 0.308 mW up to 3.35 mW. On the other hand, the corresponding relationship for the temperature analysis showed that the phonon lifetime for the in-pla

SUBMITTER: Bandyopadhyay AS 

PROVIDER: S-EPMC7237805 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature