Coherent exciton-exciton interactions and exciton dynamics in a MoSe\textsubscript{2}/WSe\textsubscript{2} heterostructure

TL;DR

This study uses multi-dimensional coherent spectroscopy to reveal coherent exciton interactions and measure the interlayer exciton binding energy in MoSe₂/WSe₂ heterostructures, advancing understanding of many-body effects in TMD materials.

Contribution

It demonstrates coherent coupling between localized excitons and measures interlayer exciton binding energy using advanced spectroscopy.

Findings

Coherent coupling observed between excitons in MoSe₂ and WSe₂.

Interlayer exciton binding energy measured at approximately 250 meV.

Identification of absorption states from free interlayer electron-hole pairs.

Abstract

Coherent coupling between excitons is at the heart of many-body interactions with transition metal dichalcogenide (TMD) heterostructures as an emergent platform for the investigation of these interactions. We employ multi-dimensional coherent spectroscopy on monolayer MoSe\textsubscript{2}/WSe\textsubscript{2} heterostructures and observe coherent coupling between excitons spatially localized in monolayer MoSe$_2$ and WSe$_2$. Through many-body spectroscopy, we further observe the absorption state arising from free interlayer electron-hole pairs. This observation yields a spectroscopic measurement of the interlayer exciton binding energy of about 250 meV.