Bosonic condensation of exciton-polaritons in an atomically thin crystal

The emergence of two-dimensional crystals has revolutionized modern solid-state physics. From a fundamental point of view, the enhancement of charge carrier correlations has sparked enormous research activities in the transport- and quantum optics communities. One of the most intriguing effects, in...

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Bibliographic Details
Published in:arXiv.org 2020-09
Main Authors: Anton-Solanas, Carlos, Waldherr, Maximilian, Martin, Klaas, Suchomel, Holger, Cai, Hui, Sedov, Evgeny, Kavokin, Alexey V, Tongay, Sefaattin, Watanabe, Kenji, Taniguchi, Takashi, Höfling, Sven, Schneider, Christian
Format: Article
Language:English
Subjects:
Coherent light
Condensates
Crystals
Current carriers
Excitons
Optical pumping
Polaritons
Quantum optics
Solid state physics
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Summary:The emergence of two-dimensional crystals has revolutionized modern solid-state physics. From a fundamental point of view, the enhancement of charge carrier correlations has sparked enormous research activities in the transport- and quantum optics communities. One of the most intriguing effects, in this regard, is the bosonic condensation and spontaneous coherence of many-particle complexes. Here, we find compelling evidence of bosonic condensation of exciton-polaritons emerging from an atomically thin crystal of MoSe2 embedded in a dielectric microcavity under optical pumping. The formation of the condensate manifests itself in a sudden increase of luminescence intensity in a threshold-like manner, and a significant spin-polarizability in an externally applied magnetic field. Spatial coherence is mapped out via highly resolved real-space interferometry, revealing a spatially extended condensate. Our device represents a decisive step towards the implementation of coherent light-sources based on atomically thin crystals, as well as non-linear, valleytronic coherent devices.
ISSN:2331-8422
DOI:10.48550/arxiv.2009.11885