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Real-space collapse of a polariton condensate

Real-space collapse of a polariton condensate
Real-space collapse of a polariton condensate
Microcavity polaritons are two-dimensional bosonic fluids with strong nonlinearities, composed of coupled photonic and electronic excitations. In their condensed form, they display quantum hydrodynamic features similar to atomic Bose–Einstein condensates, such as long-range coherence, superfluidity and quantized vorticity. Here we report the unique phenomenology that is observed when a pulse of light impacts the polariton vacuum: the fluid which is suddenly created does not splash but instead coheres into a very bright spot. The real-space collapse into a sharp peak is at odd with the repulsive interactions of polaritons and their positive mass, suggesting that an unconventional mechanism is at play. Our modelling devises a possible explanation in the self-trapping due to a local heating of the crystal lattice, that can be described as a collective polaron formed by a polariton condensate. These observations hint at the polariton fluid dynamics in conditions of extreme intensities and ultrafast times.
Dominici, L.
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Petrov, M.
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Matuszewski, M.
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Ballarini, D.
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De Giorgi, M.
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Colas, D.
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Cancellieri, E.
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Silva Fernandez, B.
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Bramati, A.
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Gigli, G.
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Kavokin, A.
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Laussy, F.
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Sanvitto, D.
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Dominici, L.
81da1cc3-e121-4825-9d34-c4e8c8d21f53
Petrov, M.
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Matuszewski, M.
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Ballarini, D.
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De Giorgi, M.
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Colas, D.
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Cancellieri, E.
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Silva Fernandez, B.
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Bramati, A.
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Gigli, G.
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Kavokin, A.
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Laussy, F.
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Sanvitto, D.
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Dominici, L., Petrov, M. and Matuszewski, M. et al. (2015) Real-space collapse of a polariton condensate. Nature Communications, 6, [8993]. (doi:10.1038/ncomms9993).

Record type: Article

Abstract

Microcavity polaritons are two-dimensional bosonic fluids with strong nonlinearities, composed of coupled photonic and electronic excitations. In their condensed form, they display quantum hydrodynamic features similar to atomic Bose–Einstein condensates, such as long-range coherence, superfluidity and quantized vorticity. Here we report the unique phenomenology that is observed when a pulse of light impacts the polariton vacuum: the fluid which is suddenly created does not splash but instead coheres into a very bright spot. The real-space collapse into a sharp peak is at odd with the repulsive interactions of polaritons and their positive mass, suggesting that an unconventional mechanism is at play. Our modelling devises a possible explanation in the self-trapping due to a local heating of the crystal lattice, that can be described as a collective polaron formed by a polariton condensate. These observations hint at the polariton fluid dynamics in conditions of extreme intensities and ultrafast times.

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Accepted/In Press date: 23 October 2015
e-pub ahead of print date: 4 December 2015
Published date: 4 December 2015
Organisations: Quantum, Light & Matter Group

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Local EPrints ID: 401290
URI: http://eprints.soton.ac.uk/id/eprint/401290
PURE UUID: 0e03d116-1d5f-43eb-adb3-8f2df465edea

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Date deposited: 11 Oct 2016 15:14
Last modified: 23 Mar 2020 17:31

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