Coherent exciton-exciton interactions and exciton dynamics in a <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mi>MoSe</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:mo>/</mml:mo><mml:msub><mml:mrow><mml:mi>WSe</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:math> heterostructure
Torben L. Purz, Eric W. Martin, Pasqual Rivera, William Holtzmann, Xiaodong Xu, Steven T. Cundiff
Abstract
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.