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Lookup NU author(s): Dr Brian Jackson,
Professor Carlo Barenghi
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We study the formation of vortices in a dilute Bose-Einstein condensate confined in a rotating anisotropic trap. We find that the number of vortices and angular momentum attained by the condensate depend upon the rotation history of the trap and on the number of vortices present in the condensate initially. A simplified model based on hydrodynamic equations is developed, and used to explain this effect in terms of a shift in the resonance frequency of the quadrupole mode of the condensate in the presence of a vortex lattice. Differences between the spin-up and spin-down response of the condensate are found, demonstrating hysteresis phenomena in this system.
Author(s): Jackson B, Barenghi CF
Publication type: Article
Publication status: Published
Journal: Physical Review A: Atomic, Molecular and Optical Physics
ISSN (print): 1050-2947
ISSN (electronic): 1094-1622
Publisher: American Physical Society
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