Excitation spectrum of vortex lattices in rotating Bose-Einstein condensates
arXiv:cond-mat/0306549 · doi:10.1103/PhysRevA.68.031605
Abstract
Using the coarse grain averaged hydrodynamic approach, we calculate the excitation spectrum of vortex lattices sustained in rotating Bose-Einstein condensates. The spectrum gives the frequencies of the common-mode longitudinal waves in the hydrodynamic regime, including those of the higher-order compressional modes. Reasonable agreement with the measurements taken in a recent JILA experiment is found, suggesting that one of the longitudinal modes reported in the experiment is likely to be the , mode.
arXiv comment2 figures. Submitted to Physical Review A. v2 contains more references. No change in the main result
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