Title
Normal and superfluid fractions of inhomogeneous nonequilibrium quantum fluids
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Subject
Physics
Source (journal)
PHYSICAL REVIEW B
Volume/pages
93(2016) :13 , 5 p.
ISSN
2469-9950
Article Reference
134511
ISI
000374529300001
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
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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Full text (open access)
https://repository.uantwerpen.be/docman/irua/cbf42b/133653.pdf
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