Observation of bosonic condensation in a hybrid monolayer MoSe 2 -GaAs microcavity

Bosonic condensation belongs to the most intriguing phenomena in physics, and was mostly reserved for experiments with ultra-cold quantum gases. More recently, it became accessible in exciton-based solid-state systems at elevated temperatures. Here, we demonstrate bosonic condensation driven by exci...

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Published inNature communications Vol. 9; no. 1; p. 3286
Main Authors Waldherr, Max, Lundt, Nils, Klaas, Martin, Betzold, Simon, Wurdack, Matthias, Baumann, Vasilij, Estrecho, Eliezer, Nalitov, Anton, Cherotchenko, Evgenia, Cai, Hui, Ostrovskaya, Elena A, Kavokin, Alexey V, Tongay, Sefaattin, Klembt, Sebastian, Höfling, Sven, Schneider, Christian
Format Journal Article
LanguageEnglish
Published England 16.08.2018
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Summary:Bosonic condensation belongs to the most intriguing phenomena in physics, and was mostly reserved for experiments with ultra-cold quantum gases. More recently, it became accessible in exciton-based solid-state systems at elevated temperatures. Here, we demonstrate bosonic condensation driven by excitons hosted in an atomically thin layer of MoSe , strongly coupled to light in a solid-state resonator. The structure is operated in the regime of collective strong coupling between a Tamm-plasmon resonance, GaAs quantum well excitons, and two-dimensional excitons confined in the monolayer crystal. Polariton condensation in a monolayer crystal manifests by a superlinear increase of emission intensity from the hybrid polariton mode, its density-dependent blueshift, and a dramatic collapse of the emission linewidth, a hallmark of temporal coherence. Importantly, we observe a significant spin-polarization in the injected polariton condensate, a fingerprint for spin-valley locking in monolayer excitons. Our results pave the way towards highly nonlinear, coherent valleytronic devices and light sources.
ISSN:2041-1723