https://doi.org/10.1140/epjd/e2009-00196-3
Influence of global features of a Bose-Einstein condensate on the vortex velocity
1
Departamento de Física, Facultad de Ciencias Exactas
y Naturales,
Universidad de Buenos Aires, RA-1428 Buenos Aires, Argentina
2
, Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina
Corresponding author: a cataldo@df.uba.ar
Received:
14
January
2009
Revised:
5
May
2009
Published online:
30
June
2009
We study the way in which the geometry of the trapping potential affects the vortex velocity in a Bose-Einstein condensate confined by a toroidal trap. We calculate the vortex precession velocity through a simple relationship between such a velocity and the gradient of the numerically obtained vortex energy. We observe that our results correspond very closely to the velocity calculated through time evolution simulations. However, we find that the estimates derived from available velocity field formulas present appreciable differences. To resolve such discrepancies, we further study the induced velocity field, analyzing the effect of global features of the condensate on such a field and on the precession velocity.
PACS: 03.75.Lm – Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations / 03.75.Kk – Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2009
