Tuesday, June 11, 2013

1306.1988 (Hamid Al-Jibbouri et al.)

Breakdown of Kohn Theorem Near Feshbach Resonance    [PDF]

Hamid Al-Jibbouri, Axel Pelster
We study the collective excitation frequencies of a harmonically trapped 85Rb Bose-Einstein condensate (BEC) in the vicinity of a Feshbach resonance. To this end, we solve the underlying Gross-Pitaevskii (GP) equation by using a Gaussian variational approach and obtain the coupled set of ordinary differential equations for the widths and the center of mass of the condensate. A linearization shows that the dipole mode frequency decreases when the bias magnetic field approaches the Feshbach resonance, so the Kohn theorem is violated.
View original: http://arxiv.org/abs/1306.1988

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