Pekko Kuopanportti, Brian P. Anderson, Mikko Möttönen
We show that topological vortex pumping can be implemented for a dilute Bose-Einstein condensate confined in a magnetic time-averaged orbiting potential trap with axial optical confinement. Contrary to earlier proposals for the vortex pump, we do not employ an additional optical potential to trap the condensate in the radial direction, but instead, this confinement is provided by the magnetic field throughout the pumping cycle. By performing numerical simulations based on the spin-1 Gross-Pitaevskii equation, we find that several pumping cycles can be carried out to produce a highly charged vortex before a majority of the particles escapes from the trap or before the vortex splits into singly quantized vortices. On the other hand, we observe that an additional, relatively weak optical plug potential is efficient in preventing splitting and reducing particle loss. With this study, we aim to bring the vortex pump closer to experimental realization.
View original:
http://arxiv.org/abs/1301.2065
No comments:
Post a Comment