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Spatial coherence of room-temperature monolayer WSe2 exciton-polaritons in a trap

: Shan, H.; Lackner, L.; Han, B.; Sedov, E.; Rupprecht, C.; Knopf, H.; Eilenberger, F.; Beierlein, J.; Kunte, N.; Esmann, M.; Yumigeta, K.; Watanabe, K.; Taniguchi, T.; Klembt, S.; Höfling, S.; Kavokin, A.V.; Tongay, S.; Schneider, C.; Anton-Solanas, C.

Volltext ()

Nature Communications 12 (2021), Art. 6406, 7 S.
ISSN: 2041-1723
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IOF ()
detection method; emergence; laser method; temperature effect

The emergence of spatial and temporal coherence of light emitted from solid-state systems is a fundamental phenomenon intrinsically aligned with the control of light-matter coupling. It is canonical for laser oscillation, emerges in the superradiance of collective emitters, and has been investigated in bosonic condensates of thermalized light, as well as exciton-polaritons. Our room temperature experiments show the strong light-matter coupling between microcavity photons and excitons in atomically thin WSe2. We evidence the density-dependent expansion of spatial and temporal coherence of the emitted light from the spatially confined system ground-state, which is accompanied by a threshold-like response of the emitted light intensity. Additionally, 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 validate the potential of atomically thin crystals as versatile components of coherent light-sources, and in valleytronic applications at room temperature.