High-Energy Interlayer Exciton Ensembles in MoSe${}_2$/WSe${}_2$ Heterostructures by Laguerre-Gaussian Excitation

Abstract

We reveal the higher energetic luminescence part of interlayer exciton ensembles in MoSe${}_2$/WSe${}_2$ heterostructures upon excitation by an optical Laguerre-Gaussian mode. The excitation is achieved with the help of a spatial light modulator giving rise to a ring-shaped distribution of interlayer excitons. A hyperspectral analysis of the exciton photoluminescence suggests that the excitation scheme allows the accumulation of high-energetic excitons in the rings' center. We discuss the mechanisms leading to such a distribution, including exciton-exciton interaction, phase-space filling, and an incomplete thermalization.