Ultrafast Dynamics of 2D Semiconductors and Their Heterostructures

Explore cutting-edge research on two-dimensional semiconductors and their heterostructures in this seminar presentation by Giulio Cerullo from Politecnico Milano. Delve into the fascinating world of layered materials, from their fundamental structure consisting of crystalline sheets with strong in-plane covalent bonds to their weak van der Waals out-of-plane interactions. Learn about the evolution of 2D materials research from graphene to semiconducting transition metal dichalcogenides (TMDs), examining their unique light-matter interactions and nonlinear optical responses. Discover how stacking these 2D materials creates heterostructures with novel physical properties dependent on factors like type, stacking sequence, and twist angle. Through high-resolution ultrafast transient absorption spectroscopy, understand the dynamics of exciton formation, strongly coupled phonons, and intravalley spin-flip processes in TMDs. Examine groundbreaking research on interlayer hole transfer, exciton formation, and electron transfer processes in heterostructures, supported by findings from multiple published studies in prestigious scientific journals.