Regensburg 2022 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 12: 2D Materials 4 (joint session HL/CPP/DS)
DS 12.4: Vortrag
Dienstag, 6. September 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 Schneider1 — 1Universität 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.