Off-axis vortices in trapped Bose-condensed gases: Angular momentum and frequency splitting


Autoria(s): Guilleumas, Montserrat; Graham, R. (Robert), 1942-
Contribuinte(s)

Universitat de Barcelona

Data(s)

04/05/2010

Resumo

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.

Identificador

http://hdl.handle.net/2445/9581

Idioma(s)

eng

Publicador

The American Physical Society

Direitos

(c) The American Physical Society, 2001

info:eu-repo/semantics/openAccess

Palavras-Chave #Condensació de Bose-Einstein #Estadística quàntica #Ionització #Bose-Einstein condensation #Quantum statistics #Ionization
Tipo

info:eu-repo/semantics/article