SKM 2021 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 5: 2D semiconductors and van der Waals heterostructures I (joint session HL/DS)
HL 5.3: Vortrag
Montag, 27. September 2021, 14:15–14:30, H4
Coherent light emission of exciton-polaritons in an atomically thin crystal at room temperature — •Hangyong Shan1, Lukas Lackner1, Bo Han1, Evgeny Sedov2, Falk Eilenberger4, Sebastian Klembt3, Sven Höfling3, Alexey V. Kavokin2, Christian Schneider1, and Carlos Anton-Solanas1 — 1Institute of Physics, Carl von Ossietzky University, 26129 Oldenburg, Germany. — 2School of Science, Westlake University, 310024 Hangzhou, People's Republic of China. — 3Technische Physik, Universität Würzburg, D-97074 Würzburg, Am Hubland, Germany. — 4Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University, 07745 Jena, Germany.
We experimentally study the coherence of exciton-polaritons in a Fabry-Perot microcavity loaded with an atomically thin WSe2 layer. Via Michelson interferometry, we capture clear evidence of increased spatial and temporal coherence of the emitted light from the spatially confined system ground-state. The coherence build-up is accompanied by a threshold-like behaviour of the emitted light intensity, which is a fingerprint of a polariton condensation effect. Valley-physics is manifested in the presence of an external magnetic field, which allows us to manipulate K and K* polaritons via the Valley-Zeeman-effect. Our findings are of high application relevance, as they confirm the possibility to use atomically thin crystals as simple and versatile components of coherent light-sources, and in valleytronic applications at room temperature.