Disentangling Many-Body Effects in the Coherent Optical Response of 2D Semiconductors.

ABSTRACT: In single-layer (1L) transition metal dichalcogenides, the reduced Coulomb screening results in strongly bound excitons which dominate the linear and the nonlinear optical response. Despite the large number of studies, a clear understanding on how many-body and Coulomb correlation effects affect the excitonic resonances on a femtosecond time scale is still lacking. Here, we use ultrashort laser pulses to measure the transient optical response of 1L-WS₂. In order to disentangle many-body effects, we perform exciton line-shape analysis, and we study its temporal dynamics as a function of the excitation photon energy and fluence. We find that resonant photoexcitation produces a blue shift of the A exciton, while for above-resonance photoexcitation the transient response at the opti

SUBMITTER: Trovatello C 

PROVIDER: S-EPMC9284612 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature