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Regensburg 2022 – scientific programme

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DS: Fachverband Dünne Schichten

DS 12: 2D Materials 4 (joint session HL/CPP/DS)

DS 12.4: Talk

Tuesday, September 6, 2022, 10:45–11:00, H36

Second order coherence of a condensate of exciton-polaritons in an atomically thin crystal — •Jens-Christian Drawer1, Hangyong Shan1, Sven Höfling2, Carlos Anton-Solanas3, Martin Esmann1, and Christian Schneider11Universität Oldenburg, Germany — 2Universität Würzburg, Germany — 3Universidad Autónoma de Madrid, Spain

We study the second order coherence of a condensate of exciton-polaritons emerging in a microcavity loaded with an atomically thin MoSe2 crystal. Under cryogenic temperatures, angle-resolved PL and reflectivity measurements reveal the formation of two polariton resonances, as the hallmark of the strong coupling regime. The characteristic condensation threshold manifests via the nonlinear input-output-characteristics of the emission. In order to gain deeper information about the photon statistics emitted from the cavity, we perform the Hanbury Brown- and Twiss experiment as a function of the polariton occupation in the effective ground state. While the emission features a bunching effect below threshold, hinting at a thermal contribution of the polariton emission, above threshold the second order correlation transits towards g(2)(τ=0)=1, which is indicative for the formation of a coherent state in the quantum optical sense.

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