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 ${\mathrm{MoSe}}_2$ embedded in ${\mathrm{SiO}}_2$, and two setups for enhancing or suppressing the phonon sideband in the spectrum.

• Received 14 February 2023
• Revised 17 October 2023
• Accepted 4 December 2023

DOI:https://doi.org/10.1103/PhysRevB.109.085308