Breakdown of Kohn Theorem Near Feshbach Resonance
Quantum Gases
2013-06-11 v1
Abstract
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.
Keywords
Cite
@article{arxiv.1306.1988,
title = {Breakdown of Kohn Theorem Near Feshbach Resonance},
author = {Hamid Al-Jibbouri and Axel Pelster},
journal= {arXiv preprint arXiv:1306.1988},
year = {2013}
}