JCMS: Hybrid Exciton Thermalization in van der Waals Heterostructures

by Dr Giuseppe Meneghini (University of Marburg)

Thursday 8 May 2025, 13:30 → 14:30 Europe/Stockholm

Albano 3: 6228 - Mega (22 seats) (Albano Building 3)

Speaker: Giuseppe Meneghini (University of Marburg). Abstract: Transition metal dichalcogenides (TMDs) exhibit enhanced light-matter and Coulomb interactions, giving rise to a rich landscape of tightly bound excitons. Stacking TMD monolayers into van der Waals heterostructures further enriches this scenario, introducing spatially separated interlayer excitons characterized by long lifetimes and a permanent out-of-plane dipole moment. Recent experiments have revealed fascinating phenomena associated with interlayer exciton formation, including ultrafast charge transfer between layers and long-lived excited states whose photoluminescence brightness depends sensitively on the twist angle. Based on a microscopic, material-realistic exciton theory, we investigate the dynamics of layer- and momentum-hybridized excitons in bilayer systems. In this talk, I will present the basic concepts of the microscopic model and illustrate how our results have helped to interpret and understand the experimental observations.