Berlin 2024 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 56: Heterostructures, Interfaces and Surfaces II
HL 56.3: Talk
Friday, March 22, 2024, 10:00–10:15, EW 561
Time-resolved unidirectional propagation of exciton-polariton condensates in a Kagome edge mode — •Christian G. Mayer1, Tristan H. Harder1, Philipp Gagel1, Simon Betzold1, Monika Emmerling1, Adriana Wolf1, Michael D. Fraser2,3, Sebastian Klembt1, and Sven Höfling1 — 1Julius-Maximilians-Universität Würzburg, Physikalisches Institut and Würzburg-Dresden Cluster of Excellence ct.qmat, Lehrstuhl für Technische Physik, Am Hubland, 97074 Würzburg, Germany — 2RIKEN Center for Emergent Matter Science Wako-shi, Saitama 351-0198, Japan — 3Physics & Informatics Laboratories (PHI Lab) NTT Research, Inc. Sunnyvale, CA 94085, USA
Strongly coupled Fabry-Pérot microcavity photons with excitons form hybrid light-matter particles called exciton-polaritons. Surpassing a critical density and inherited by their bosonic statistics, they undergo a phase transition towards a dynamic condensate by stimulated scattering into ground state. Confining the photonic mode in micropillars, an artificial photonic lattice can be created. By implementing this technique, the photonic potential landscape can be shaped to emulate the band structure of a two-dimensional lattice by coupling many pillars.
Here, we utilize a Kagome lattice, in which we observe a site-dependent unidirectional propagation of the polariton condensate along the dense edge due to its intrinsic asymmetric potential. We use a streak camera to time-resolve and visualize the propagation along the edge for multiple lattice sites.
Keywords: Unidirectional propagation; Streak camera; Exciton-polariton condensate; Kagome lattice; Photonic landscape