Precision Measurements of Collective Oscillations in the BEC-BCS Crossover
arXiv:cond-mat/0609390 · doi:10.1103/PhysRevLett.98.040401
Abstract
We report on precision measurements of the frequency of the radial compression mode in a strongly interacting, optically trapped Fermi gas of Li-6 atoms. Our results allow for a test of theoretical predictions for the equation of state in the BEC-BCS crossover. We confirm recent quantum Monte-Carlo results and rule out simple mean-field BCS theory. Our results show the long-sought beyond-mean-field effects in the strongly interacting BEC regime.
improved discussion of small ellipticity and anharmonicity corrections