期刊
NATURE COMMUNICATIONS
卷 9, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-018-05532-7
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资金
- ERC [unLiMIt-2D]
- DFG [SCHN1376 3-1]
- State of Bavaria
- Ministry of Education and Science of Russian Federation [14.Y26.31.0015, 3.2614.2017/4.6]
- St-Petersburg State University [11.34.2.2012]
- EPSRC Hybrid Polaritonics programme grant [EP/M025330/1]
- European Commission
- NSF [DMR 1838443, DMR 1552220]
- EPSRC [EP/M025330/1] Funding Source: UKRI
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.
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