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23 April 2024

» pubmed » pmid17358745

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Precision measurements of collective oscillations in the BEC-BCS crossover
A Altmeyer ; S Riedl ; C Kohstall ; M J Wright ; R Geursen ; M Bartenstein ; C Chin ; J Hecker Denschlag ; R Grimm ;
Date:	26 Jan 2007
Journal:	Phys Rev Lett, 98 (4), 040401
Abstract:	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.
Source:	PubMed, pmid17358745
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