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HL: Fachverband Halbleiterphysik

HL 5: Heterostructures, interfaces and surfaces

HL 5.1: Vortrag

Montag, 27. März 2023, 10:00–10:15, POT 112

Time-resolved analysis of propagating exciton-polariton condensates in photonic potential landscapes. — •Christian G. Mayer, Philipp Gagel, Simon Betzold, Tristan H. Harder, Monika Emmerling, Adriana Wolf, Fauzia Jabeen, Sven Höfling, and Sebastian Klembt — Technische Physik, RCCM and Würzburg-Dresden Cluster of Excellence ct.qmat, University of Würzburg, Germany

Confining photons in a Fabry-Perot microcavity and coupling them strongly to excitons leads to the formation of hybrid matter-light particles named exciton-polaritons (polaritons). Owing to their bosonic statistics, they undergo a phase transition above a critical density to a dynamic condensate via stimulated scattering. Polaritons have quite long diffusion length compared to excitons because of their lower effective mass inherited by their photonic fraction. Propagation effects of a polariton condensate take place on a time scale of a few picoseconds and are caused by the repulsive potential facilitated by the matter fraction due to polariton-exciton and polariton-polariton interactions. By varying the light-matter composition of the polariton condensate, we investigate changes in the propagation properties such as velocity and length.
Using electron beam lithography, we spatially confine propagating polaritons in waveguides, as well as in resonator lattices supporting quantum valley Hall modes. Using a streak camera, the propagation of the polariton condensate is measured in a variety of confined structures and systems.