Abstract

After the discovery of zero viscosity in liquid helium, other fundamental properties of the superfluidity phenomenon have been revealed. One of them, irrotational flow, gives rise to quantized vortices and persistent currents. Those are the landmarks of superfluidity in its modern understanding. Recently, a new variety of dissipationless fluid behaviour has been found in microcavities under the optical parametric regime. Here we report the observation of metastable persistent polariton superflows sustaining a quantized angular momentum, m, after applying a 2-ps laser pulse carrying a vortex state. We observe a transfer of angular momentum to the steady-state condensate, which sustains vorticity for as long as it can be tracked. Furthermore, we study the stability of quantized vortices with m=2. The experiments are analysed using a generalized two-component Gross-Pitaevskii equation. These results demonstrate the control of metastable persistent currents and show the peculiar superfluid character of non-equilibrium polariton condensates.

Autore Pugliese

• Sanvitto Daniele

Tutti gli autori

• Sanvitto D.; Marchetti F.M.; Szymanska M.H.; Tosi G.; Baudisch M.; Laussy F.P.; Krizhanovskii D.N.; Skolnick M.S.; Marrucci L.; Lemaitre A.; Bloch J.; Tejedor C.; Vina L.

Titolo volume/Rivista

Nature physics

Anno di pubblicazione

2010

ISSN

1745-2473

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

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Numero di citazioni Scopus

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Ultimo Aggiornamento Citazioni

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Settori ERC

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Codici ASJC

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