The Joint Condensed Matter Seminar (JCMS) series is organised by KTH Royal Insitute of Technology, Nordita, and Stockholm University.
On Thursday, May 8th, 2025 from 13.30 am to 14.30 we will host a seminar by Giuseppe Meneghini from University of Marburg.
Hybrid Exciton Thermalization in van der Waals Heterostructures
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.