Vortex pump for Bose-Einstein condensates utilizing a time-averaged orbiting potential trap

Pekko Kuopanportti, Brian P. Anderson, and Mikko Möttönen
Phys. Rev. A 87, 033623 – Published 25 March 2013

Abstract

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, the radial 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 escape from the trap or before the vortex splits into singly charged 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 these results, we hope to bring the vortex pump closer to experimental realization.

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  • Received 10 January 2013

DOI:https://doi.org/10.1103/PhysRevA.87.033623

©2013 American Physical Society

Authors & Affiliations

Pekko Kuopanportti1,*, Brian P. Anderson2, and Mikko Möttönen1,3

  • 1QCD Labs, COMP Centre of Excellence, Department of Applied Physics, Aalto University, P.O. Box 13500, FI-00076 Aalto, Finland
  • 2College of Optical Sciences, University of Arizona, Tucson, Arizona 85721, USA
  • 3Low Temperature Laboratory (OVLL), Aalto University, P.O. Box 13500, FI-00076 Aalto, Finland

  • *Present address: Department of Physics, P.O. Box 43, FI-00014 University of Helsinki, Finland; pekko.kuopanportti@gmail.com

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Issue

Vol. 87, Iss. 3 — March 2013

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