Regensburg 2019 – wissenschaftliches Programm
SYIS 1.3: Hauptvortrag
Donnerstag, 4. April 2019, 16:00–16:30, H1
Light-Matter interaction in van der Waals heterostructures — •Tobias Korn — Institut für Physik, Universität Rostock, Albert-Einstein-Straße 23 - 24, 18059 Rostock
In recent years, two-dimensional crystals and their van der Waals heterostructures have garnered a lot of attention. Their surprisingly strong interaction with light has been one of the key features in enabling the rapid growth of this research field, starting with the direct visibility of graphene in optical microscopy. Since then, optical spectroscopy has become an ideal probe for electronic structure, crystallographic alignment and interlayer interactions. In semiconducting two-dimensional crystals, such as transition-metal dichalcogenides, optical techniques give access to a variety of quasiparticles, such as excitons, trions and biexcitons, with peculiar properties due to the complex, multivalley band structure of the host material.
The combination of different two-dimensional crystals into van der Waals heterostructures has given rise to a novel form of quasiparticles, so-called interlayer excitons, in which the constituent electrons and holes are spatially separated into different layers. By designing the material combination and crystallographic alignment (twist angle) of the heterostructures, we can custom-tailor interlayer exciton properties, providing a highly interesting platform for basic research and potential optoelectronic applications.