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, R. Grimm
TL;DR
This paper presents precise experimental measurements of collective oscillation frequencies in a strongly interacting Fermi gas across the BEC-BCS crossover, testing theoretical models and confirming beyond-mean-field effects.
Contribution
It provides high-precision data that validate quantum Monte-Carlo predictions and challenge simple mean-field theories in the BEC-BCS crossover regime.
Findings
Confirmed quantum Monte-Carlo predictions
Ruled out simple mean-field BCS theory
Observed beyond-mean-field effects in the BEC regime
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.
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