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.

Keywords

PhysicsCrossoverQuantum Monte CarloMonte Carlo methodMean field theoryFermi Gamma-ray Space TelescopeFermi gasBCS theoryStatistical physicsField (mathematics)Quantum mechanicsEquation of stateCondensed matter physicsQuantumQuantum electrodynamicsSuperconductivityElectronPairing

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Publication Info

Year
2007
Type
article
Volume
98
Issue
4
Pages
040401-040401
Citations
235
Access
Closed

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A. Altmeyer, Stefan Riedl, Christoph Kohstall et al. (2007). Precision Measurements of Collective Oscillations in the BEC-BCS Crossover. Physical Review Letters , 98 (4) , 040401-040401. https://doi.org/10.1103/physrevlett.98.040401

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DOI
10.1103/physrevlett.98.040401