Precision Measurements of Collective Oscillations in the BEC-BCS Crossover

A. Altmeyer , S. Riedl , C. Kohstall , M. Wright , R. Geursen , M. Bartenstein , C. Chin , J. Hecker Denschlag

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R. Grimm

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classification ❄️ cond-mat.other cond-mat.supr-con

keywords resultsbec-bcscrossoverinteractingmeasurementsprecisionstronglyallow

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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.

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Precision Measurements of Collective Oscillations in the BEC-BCS Crossover

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