Expansion of a Fermi Cloud in the BCS-BEC Crossover

Details Expansion of a Fermi Cloud in the BCS-BEC Crossover Expansion of a Fermi Cloud in the BCS-BEC Crossover

2006-03-14

arxiv.org/abs/cond-mat/0603384v2

Phys. Rev. A 73, 065601 (2006)

Physics

Condensed Matter

Statistical Mechanics

5 pages, 3 figures

Scientific paper

10.1103/PhysRevA.73.065601

We study the free expansion of a dilute two-component Fermi gas with attractive interspecies interaction in the BCS-BEC crossover. We apply a time-dependent parameter-free density-functional theory by using two choices of the equation of state: an analytic formula based on Monte Carlo data and the mean-field equation of state resulting from the extended BCS equations. The calculated axial and transverse radii and the aspect ratio of the expanding cloud are compared to experimental data on vapors of ^6Li atoms. Remarkably, the mean-field theory shows a better agreement with the experiments than the theory based on the Monte Carlo equation of state. Both theories predict a measurable dependence of the aspect ratio on expansion time and on scattering length.

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