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Phys Rev Lett. 2007 Jan 26;98(4):040401. Epub 2007 Jan 22.

Precision measurements of collective oscillations in the BEC-BCS crossover.

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Institute of Experimental Physics, Center for Quantum Physics, University of Innsbruck, 6020 Innsbruck, Austria.


We report on precision measurements of the frequency of the radial compression mode in a strongly interacting, optically trapped Fermi gas of (6)Li 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 Bose-Einstein condensation (BEC) regime.

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