Hysteresis effects in rotating Bose-Einstein condensates

Details Hysteresis effects in rotating Bose-Einstein condensates Hysteresis effects in rotating Bose-Einstein condensates

2006-02-14

arxiv.org/abs/cond-mat/0602334v2

Physics

Condensed Matter

Statistical Mechanics

16 pages, 7 figures; revised after referees' reports

Scientific paper

10.1103/PhysRevA.74.043618

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 depends 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.

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