Collective modes and ballistic expansion of a fermi gas in the BCS-BEC crossover.

@article{Hu2004CollectiveMA,
  title={Collective modes and ballistic expansion of a fermi gas in the BCS-BEC crossover.},
  author={Hui Hu and Anna Minguzzi and Xia-ji Liu and Mario P. Tosi},
  journal={Physical review letters},
  year={2004},
  volume={93 19},
  pages={
          190403
        }
}
We evaluate the frequencies of collective modes and the anisotropic expansion rate of a harmonically trapped Fermi superfluid at varying coupling strengths across a Feshbach resonance driving a BCS-BEC crossover. The equations of motion for the superfluid are obtained from a microscopic mean-field expression for the compressibility and are solved within a scaling ansatz. Our results confirm nonmonotonic behavior in the crossover region and are in quantitative agreement with current measurements… 
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