Precision Measurements of Collective Oscillations in the BEC-BCS Crossover

Journal Article · Fri Jan 26 04:00:00 EST 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.98.040401· OSTI ID:20861626

Altmeyer, A; Kohstall, C; Wright, M J; Geursen, R; Bartenstein, M; Denschlag, J Hecker ^[1]; Riedl, S; Grimm, R ^[1]; Chin, C ^[2]

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1. Institute of Experimental Physics and Center for Quantum Physics, University of Innsbruck, 6020 Innsbruck (Austria)
2. James Franck Institute, Physics Department of the University of Chicago, Chicago, Illinois 60637 (United States)

We report on precision measurements of the frequency of the radial compression mode in a strongly interacting, optically trapped Fermi gas of {sup 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.

• OSTI ID: 20861626
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 4 Vol. 98; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BCS THEORY
BOSE-EINSTEIN CONDENSATION
EQUATIONS OF STATE
FERMI GAS
LITHIUM 6
MEAN-FIELD THEORY
MONTE CARLO METHOD
OSCILLATIONS
TRAPPING