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SYWH: Symposium Physics of van der Waals 2D heterostructures

SYWH 1: Physics of van der Waals 2D heterostructures

SYWH 1.5: Hauptvortrag

Mittwoch, 18. März 2020, 17:00–17:30, HSZ 02

Excitons in 2D Semiconductors and Heterostructures — •Alexander Högele — Fakultät für Physik, Munich Quantum Center, and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität München, München, Germany

Van der Waals crystals of transition metal dichalcogenide (TMD) semiconductors have evolved as an increasingly significant material platform for condensed matter research. They can be routinely exfoliated down to the monolayer limit or assembled into rationally designed vertical heterostructures. Both semiconductor systems host strongly bound excitons that dominate the optical properties via valley-contrasting dipolar transitions. Using optical spectroscopy at cryogenic temperatures and in the presence of external magnetic fields, we study the characteristic signatures of spin-valley polarized excitons in TMD monolayers and heterostructures, and discuss their role for the elementary optical responses in absorption and emission.