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Title: Off-axis vortices in trapped Bose-condensed gases: Angular momentum and frequency splitting
Author: Guilleumas, Montserrat
Graham, R. (Robert), 1942-
Keywords: Condensació de Bose-Einstein
Estadística quàntica
Bose-Einstein condensation
Quantum statistics
Issue Date: 2001
Publisher: The American Physical Society
Abstract: We consider noncentered vortices and their arrays in a cylindrically trapped Bose-Einstein condensate at zero temperature. We study the kinetic energy and the angular momentum per particle in the Thomas-Fermi regime and their dependence on the distance of the vortices from the center of the trap. Using a perturbative approach with respect to the velocity field of the vortices, we calculate, to first order, the frequency shift of the collective low-lying excitations due to the presence of an off-center vortex or a vortex array, and compare these results with predictions that would be obtained by the application of a simple sum-rule approach, previously found to be very successful for centered vortices. It turns out that the simple sum-rule approach fails for off-centered vortices.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i
It is part of: Physical Review A, 2001, vol. 64, núm. 3, p. 033607.
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ISSN: 1050-2947
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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