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Landau critical velocity in weakly interacting Bose gases
KTH, Centra, Nordic Institute for Theoretical Physics NORDITA.
2012 (engelsk)Inngår i: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 86, nr 2, s. 023602-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The flow of a uniform Bose gas at speeds greater than the Landau critical velocity nu(c) does not necessarily destroy superfluidity, but rather needs only to lead to a decrease of the superfluid mass density rho(s). Analyzing a weakly interacting Bose gas with a finite-range interparticle interaction that leads to a Landau critical velocity at nonzero quasiparticle momentum, we explicitly construct the (nonuniform) condensate for fluid flow faster than nu(c) and calculate the accompanying decrease in rho s. We briefly comment on the relation of the physics to other problems in superfluids, e.g., solitons and vortices in Bose-Einstein condensates, and critical currents in superconductors.

sted, utgiver, år, opplag, sider
2012. Vol. 86, nr 2, s. 023602-
Emneord [en]
Superfluid, Stability, Currents, Vortex
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-101735DOI: 10.1103/PhysRevA.86.023602ISI: 000307060500009Scopus ID: 2-s2.0-84864764768OAI: oai:DiVA.org:kth-101735DiVA, id: diva2:549059
Merknad

QC 20120903

Tilgjengelig fra: 2012-09-03 Laget: 2012-09-03 Sist oppdatert: 2017-12-07bibliografisk kontrollert

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