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Title
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Superfluidity and critical velocities in nonequilibrium Bose-Einstein condensates
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Author
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Abstract
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| 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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Language
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English
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Source (journal)
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Physical review letters. - New York, N.Y., 1958, currens
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Publication
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New York, N.Y.
:
American Physical Society
,
2010
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ISSN
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0031-9007
[print]
1079-7114
[online]
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DOI
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10.1103/PHYSREVLETT.105.020602
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Volume/pages
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105
:2
(2010)
, 4 p.
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Article Reference
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020602
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ISI
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000279651100001
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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Full text (open access)
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