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Phys. Rev. A 81, 023603 (2010) [8 pages]

Core sizes and dynamical instabilities of giant vortices in dilute Bose-Einstein condensates

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Pekko Kuopanportti*
Department of Applied Physics/COMP, Aalto University School of Science and Technology, P.O. Box 15100, FI-00076 AALTO, Finland

Emil Lundh
Department of Physics, Umeå University, SE-90187 Umeå, Sweden

Jukka A. M. Huhtamäki
Department of Applied Physics/COMP, Aalto University School of Science and Technology, P.O. Box 15100, FI-00076 AALTO, Finland and Department of Physics, Okayama University, Okayama 700-8530, Japan

Ville Pietilä
Department of Applied Physics/COMP, Aalto University School of Science and Technology, P.O. Box 15100, FI-00076 AALTO, Finland and Australian Research Council Centre of Excellence for Quantum Computer Technology, School of Electrical Engineering and Telecommunications, University of New South Wales, Sydney NSW 2052, Australia

Mikko Möttönen
Department of Applied Physics/COMP, Aalto University School of Science and Technology, P.O. Box 15100, FI-00076 AALTO, Finland, Australian Research Council Centre of Excellence for Quantum Computer Technology, School of Electrical Engineering and Telecommunications, University of New South Wales, Sydney NSW 2052, Australia, and Low Temperature Laboratory, Aalto University School of Science and Technology, P.O. Box 13500, FI-00076 AALTO, Finland

Received 17 July 2009; published 5 February 2010

Motivated by a recent demonstration of cyclic addition of quantized vorticity into a Bose-Einstein condensate, the vortex pump, we study dynamical instabilities and core sizes of giant vortices. The core size is found to increase roughly as a square-root function of the quantum number of the vortex, whereas the strength of the dynamical instability either saturates to a fairly low value or increases extremely slowly for large quantum numbers. Our studies suggest that giant vortices of very high angular momenta may be achieved by gradually increasing the operation frequency of the vortex pump.

© 2010 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.81.023603
DOI:
10.1103/PhysRevA.81.023603
PACS:
03.75.Lm, 03.75.Kk, 67.85.De

*pekko.kuopanportti@tkk.fi

 
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