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

TL;DR

This study demonstrates that Laguerre-Gaussian optical excitation can generate high-energy interlayer exciton ensembles in MoSe₂/WSe₂ heterostructures, revealing new ways to control exciton distributions with structured light.

Contribution

It introduces a novel excitation method using Laguerre-Gaussian modes to manipulate interlayer exciton energy states in 2D heterostructures.

Findings

High-energy excitons accumulate in the ring center of the excitation pattern.

Laguerre-Gaussian excitation creates a ring-shaped exciton distribution.

Mechanisms include exciton interactions, phase-space filling, and thermalization effects.

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.