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Generalized Criterion for Stability of Superflow Past an Obstacle.
- Source :
-
Journal of Low Temperature Physics . Jan2010, Vol. 158 Issue 1/2, p92-98. 7p. 2 Graphs. - Publication Year :
- 2010
-
Abstract
- Abstract  We propose a new criterion of stability or instability of one-directional superflow of Bose condensates. In d-dimensional condensates with steady superflow, spectral function of the local density at the critical velocity behaves as Ï(r,Ï)â Ï Î² with βd at low Ï while Ï(r,Ï)â Ï d below the critical velocity. We confirm the validity of our criterion within the Gross-Pitaevskii-Bogoliubov theory. In the presence of a penetrable repulsive potential, β is given by dâ2 at the critical velocity, where gray-soliton-phonon emission leads to the breakdown of superfluidity. In the case of the Landau instability in spatially uniform systems, on the other hand, β=â1/3,1/3,1 for d=1,2,3, respectively. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00222291
- Volume :
- 158
- Issue :
- 1/2
- Database :
- Academic Search Index
- Journal :
- Journal of Low Temperature Physics
- Publication Type :
- Academic Journal
- Accession number :
- 47274439
- Full Text :
- https://doi.org/10.1007/s10909-009-9990-z