Title
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Normal and superfluid fractions of inhomogeneous nonequilibrium quantum fluids
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Author
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Abstract
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We present a theoretical analysis of the normal and superfluid fractions of quantum fluids described by a nonequilibrium extension of the Gross-Pitaevskii equation in the presence of an external potential. Both disordered and regular potentials are considered. The normal and superfluid fractions are defined by the response of the nonequilibrium quantum fluid to a vector potential, in analogy with the equilibrium case. We find that the physical meaning of these definitions breaks down out of equilibrium. The normal and superfluid fractions no longer add up to one and for some types of external potentials they can even become negative. |
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Language
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English
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Source (journal)
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Physical review B / American Physical Society. - New York, N.Y, 2016, currens
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Publication
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New York, N.Y
:
American Physical Society
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2016
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ISSN
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2469-9969
[online]
2469-9950
[print]
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DOI
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10.1103/PHYSREVB.93.134511
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Volume/pages
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93
:13
(2016)
, 5 p.
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Article Reference
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134511
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ISI
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000374529300001
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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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