https://ubc.zoom.us/j/68470173961?pwd=RTZEak9Pd01WajVOZHN5SW5YZHcyQT09
Meeting ID: 684 7017 3961
Passcode: 113399

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 [1].

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 [2]. 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 [3].

Polariton dispersion relation below (0.1 P_th, panel a, excitation laser at 1.671 eV) and above threshold (2P_th, 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.

[1] C. Schneider et al. Nature Commun. 9, 2695 (2018).

[2] C. Anton-Solanas, et al. Nature Materials 1-7 (2021).