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Observation of bosonic condensation in a hybrid monolayer MoSe2-GaAs microcavity

Observation of bosonic condensation in a hybrid monolayer MoSe2-GaAs microcavity
Observation of bosonic condensation in a hybrid monolayer MoSe2-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 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.

1-16
Waldherr, Max
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Lundt, Nils
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Klaas, Martin
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Betzold, Simon
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Wurdack, Matthias
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Baumann, Vasilij
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Estrecho, Eliezer
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Nalitov, Anton
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Cherotchenko, Evgenia
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Cai, Hui
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Ostrovskaya, Elena A.
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Kavokin, Alexey V.
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Tongay, Sefaattin
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Klembt, Sebastian
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Höfling, Sven
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Schneider, Christian
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Waldherr, Max
549e7797-71a7-4513-9b06-974286731716
Lundt, Nils
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Klaas, Martin
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Betzold, Simon
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Wurdack, Matthias
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Baumann, Vasilij
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Estrecho, Eliezer
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Nalitov, Anton
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Cherotchenko, Evgenia
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Cai, Hui
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Ostrovskaya, Elena A.
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Kavokin, Alexey V.
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Tongay, Sefaattin
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Klembt, Sebastian
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Höfling, Sven
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Schneider, Christian
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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 and Schneider, Christian (2018) Observation of bosonic condensation in a hybrid monolayer MoSe2-GaAs microcavity. Nature Communications, 9 (1), 1-16. (doi:10.1038/s41467-018-05532-7).

Record type: Article

Abstract

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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Accepted/In Press date: 11 July 2018
e-pub ahead of print date: 16 August 2018
Published date: 1 December 2018

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Local EPrints ID: 424549
URI: https://eprints.soton.ac.uk/id/eprint/424549
PURE UUID: fabc2124-eddc-4347-8165-1bbf5232f6fe

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Date deposited: 05 Oct 2018 11:38
Last modified: 13 Mar 2019 18:07

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