Observation of bosonic condensation in a hybrid monolayer MoSe2-GaAs microcavity
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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 MoSe2, 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.
Waldherr , M , Lundt , N , Klaas , M , Betzold , S , Wurdack , M , Baumann , V , Estrecho , E , Nalitov , A , Cherotchenko , E , Cai , H , Ostrovskaya , E A , Kavokin , A , Tongay , S , Klembt , S , Höfling , S & Schneider , C 2018 , ' Observation of bosonic condensation in a hybrid monolayer MoSe 2 -GaAs microcavity ' , Nature Communications , vol. 9 , 3286 . https://doi.org/10.1038/s41467-018-05532-7
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DescriptionC.S. acknowledges support by the ERC (Project unLiMIt-2D), and the DFG within the Project SCHN1376 3-1. The Würzburg group acknowledges support by the State of Bavaria. A.N. and E.C. acknowledge the support from the megagrant 14.Y26.31.0015 and Goszadanie no. 3.2614.2017/4.6 of the Ministry of Education and Science of Russian Federation. A.V.K. acknowledges the support from the St-Petersburg State University in framework of the project 188.8.131.522. S.H. and A.V.K. are grateful for funding received within the EPSRC Hybrid Polaritonics programme grant (EP/M025330/1). S.K. acknowledges the European Commission for the H2020 Marie Skłodowska-Curie Actions fellowship (Topopolis). S.T acknowledges support from NSF DMR 1838443 and NSF DMR 1552220.
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