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Christian Schneider: Exciton-Polaritons and their condensates in microcavities loaded with atomically thin crystals
February 10 @ 10:00 am - 11:00 am
Meeting ID: 684 7017 3961
Speaker: Christian Schneider, Institute of Physics, University of Oldenburg
Monolayer transition metal dichalcogenides (TMDC) have emerged as a new platform for studies of tightly bound excitons and many-body excitations in ultimately thin materials. Their giant dipole coupling to optical fields makes them very appealing for implementing novel photonic devices, and for fundamental investigations in the framework of cavity quantum electrodynamics .
In the regime of strong light-matter coupling between TMDC excitons and microcavity photons , the effect of bosonic condensation of becomes evident in the high-density regime . I will address the question on the emergence of long-range first-order spatial coherence, via interferometric g(1)(t) measurements (Fig. 1c). I will finally discuss the emergence of coherence of exciton-polaritons in a trap at room temperature .
Polariton dispersion relation below (0.1 Pth, panel a, excitation laser at 1.671 eV) and above threshold (2Pth, panel b). (c) Real space interference pattern produced in a Michelson interferometer, with a zero delay between the two interfering paths, and one retro-reflected image.
 C. Schneider et al. Nature Commun. 9, 2695 (2018).
 C. Anton-Solanas, et al. Nature Materials 1-7 (2021).