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arXiv · 2009.11885

Bosonic condensation of exciton-polaritons in an atomically thin crystal

Carlos Anton-Solanas·Maximilian Waldherr·Martin Klaas·Holger Suchomel·Hui Cai·Evgeny Sedov·Alexey V. Kavokin·Sefaattin Tongay·Kenji Watanabe·Takashi Taniguchi·Sven Höfling·Christian Schneider
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Abstract

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.

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Carlos Anton-Solanas, Maximilian Waldherr, Martin Klaas, Holger Suchomel, Hui Cai, Evgeny Sedov, Alexey V. Kavokin, Sefaattin Tongay, Kenji Watanabe, Takashi Taniguchi, Sven Höfling, Christian Schneider. 2020-09-24. Bosonic condensation of exciton-polaritons in an atomically thin crystal. https://doi.org/10.1038/s41563-021-01000-8

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