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- Title
Spatial coherence of room-temperature monolayer WSe<sub>2</sub> exciton-polaritons in a trap.
- Authors
Shan, Hangyong; Lackner, Lukas; Han, Bo; Sedov, Evgeny; Rupprecht, Christoph; Knopf, Heiko; Eilenberger, Falk; Beierlein, Johannes; Kunte, Nils; Esmann, Martin; Yumigeta, Kentaro; Watanabe, Kenji; Taniguchi, Takashi; Klembt, Sebastian; Höfling, Sven; Kavokin, Alexey V.; Tongay, Sefaattin; Schneider, Christian; Antón-Solanas, Carlos
- Abstract
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. Here, the authors show that the interaction between microcavity photons and excitons in an atomically thin WSe2 results in a hybridized regime of strong light-matter coupling. Coherence build-up is accompanied by a threshold-like behaviour of the emitted light intensity, which is a fingerprint of a polariton laser effect.
- Subjects
COHERENCE (Optics); POLARITONS; LIGHT intensity; MAGNETIC fields; MONOMOLECULAR films; SUPERRADIANCE
- Publication
Nature Communications, 2021, Vol 12, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-021-26715-9