Coherent exciton-exciton interactions and exciton dynamics in a MoSe2/WSe2 heterostructure

Coherent coupling between excitons is at the heart of many-body interactions and quantum information with transition metal dichalcogenide heterostructures as an emergent platform for the investigation of these interactions. We employ multidimensional coherent spectroscopy on monolayer MoSe₂/WSe₂ heterostructures and observe coherent coupling between excitons spatially localized in monolayer MoSe₂ and WSe₂. 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.