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 ${\mathrm{MoSe}}_2/{\mathrm{WSe}}_2$ heterostructures and observe coherent coupling between excitons spatially localized in monolayer ${\mathrm{MoSe}}_2$ and ${\mathrm{WSe}}_2$. 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.

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• Excitons
• Nonlinear optics
• Dichalcogenides
• Heterostructures
• Quantum wells
• Semiconductor compounds
• Optical spectroscopy