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research article

Superfluidity and Critical Velocities in Nonequilibrium Bose-Einstein Condensates

Wouters, Michiel
•
Carusotto, Iacopo
2010
Physical Review Letters

We theoretically study the superfluidity properties of a nonequilibrium Bose-Einstein condensate of exciton polaritons in a semiconductor microcavity under incoherent pumping. The dynamics of the condensate is described at mean-field level in terms of a generalized Gross-Pitaevskii equation. The drag force on a small moving object and the onset of fringes in the density profile are shown to have a sharp threshold as a function of the velocity; a generalized Landau criterion is developed to explain this behavior in terms of the dispersion of elementary excitations. Metastability of supercurrents in multiply-connected geometries is shown to persist up to higher flow speeds.

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Type
research article
DOI
10.1103/PhysRevLett.105.020602
Web of Science ID

WOS:000279651100001

Author(s)
Wouters, Michiel
Carusotto, Iacopo
Date Issued

2010

Published in
Physical Review Letters
Volume

105

Article Number

020602

Subjects

Semiconductor Microcavities

•

Polariton Condensate

•

Quantized Vortices

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
ITP  
Available on Infoscience
December 16, 2011
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/75351
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