Motions in a bose condensate: VI. Vortices in a nonlocal model

Citation
Ng. Berloff et Ph. Roberts, Motions in a bose condensate: VI. Vortices in a nonlocal model, J PHYS A, 32(30), 1999, pp. 5611-5625
Citations number
23
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL
ISSN journal
0305-4470 → ACNP
Volume
32
Issue
30
Year of publication
1999
Pages
5611 - 5625
Database
ISI
SICI code
0305-4470(19990730)32:30<5611:MIABCV>2.0.ZU;2-L
Abstract
Nonlocal nonlinear Schrodinger equations are considered as models of liquid helium II. The models contain a nonlocal interaction potential that leads to a phonon-roton-like dispersion relation. Also, a higher-order term in th e local density approximation for the correlation energy is introduced into the model to overcome nonphysical mass concentrations. These equations are solved for straight-line vortices. It is demonstrated that the parameters of the equation can be chosen to bring into agreement the vortex core param eter and the healing length. The structure of vortex rings of large radius is studied. The family of the vortex rings of different radii propagating w ith different velocities is found numerically. As the velocity of the vorte x ring reaches the Landau critical velocity the sequence of rings terminate s.