Prof. Dr. Christian Schneidervom Institut für Physik der Carl von Ossietzky Universität Oldenburg.

Controlling Excitons in van der Waals heterostructures with tunable optical cavities

Monolayer transition metal dichalcogenides (TMDC) have emerged as a new and interesting  platform for studies of tightly bound exciton in ultimately thin materials. Their giant dipole coupling to optical fields makes them very appealing for implementing novel photonic devices, and for fundamental, as well as quantum photonic investigations in the framework of cavity quantum electrodynamics [1].

I will discuss the implementation of open optical cavities in liquid helium free optical cryostats [2], which are ideally suited for the study of exciton-polaritons using van der Waals materials. Our study involves the cavity control of TMDC quantum dots, which can be operated as very efficient single photon sources, but is extended to the investigation of the cavity-controlled Moiré trapped excitons in the weak coupling regime, as well as the magnetic properties of charge-correlated exciton-polaritons in the regime of strong light-matter interaction.  

[1] C. Schneider et al. Nature Comm. 9, 2695 (2018).
[2] J. Drawer, V. Mitryakhin et al. Nano letters, 23, 8683 (2023)