Suppression and amplification of phonon sidebands in transition metal dichalcogenides by optical feedback

TL;DR

This paper investigates how optical feedback can control phonon sidebands in transition metal dichalcogenides, revealing mechanisms to enhance or suppress these features in their optical spectra.

Contribution

It introduces a self-consistent approach to analyze non-Markovian exciton-phonon interactions and demonstrates control over phonon sidebands in TMDCs using optical feedback.

Findings

Optical feedback can modify the linewidth of excitonic transitions.

Phonon sidebands can be selectively enhanced or suppressed.

Theoretical framework applies to various geometries of TMDCs.

Abstract

Transition metal dichalcogenides (TMDCs) combine both strong light-matter-interaction and strong Coulomb-interaction for the formation of optically excitable excitons. Through radiative feedback control, a mechanism to control the linewidth can be applied, which modifies optical transition spectra. Here, we extend these investigations to the absorption spectra of TMDCs in a variety of geometries with respect to non-Markovian exciton-phonon-scattering contributions. Our approach is based on the self consistent solution of the microscopic Bloch equations and the macroscopic solution of the wave equation. We discuss the formation of a phonon sideband for MoSe$_2$ embedded in SiO$_2$, and two setups for enhancing or suppressing the phonon sideband in the spectrum.