Title
Superfluidity and critical velocities in nonequilibrium Bose-Einstein condensates Superfluidity and critical velocities in nonequilibrium Bose-Einstein condensates
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
New York, N.Y. ,
Subject
Physics
Source (journal)
Physical review letters. - New York, N.Y.
Volume/pages
105(2010) :2 , 4 p.
ISSN
0031-9007
Article Reference
020602
Carrier
E-only publicatie
Target language
English (eng)
Full text (Publishers DOI)
Abstract
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.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/4abd6c/90aa0f8f.pdf