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Equation of state and collective frequencies of a trapped Fermi gas along the BEC-unitarity crossover

By G. E. Astrakharchik, R. Combescot, X. Leyronas and S. Stringari

Abstract

4 pages, 3 figuresWe show that the study of the collective oscillations in a harmonic trap provides a very sensitive test of the equation of state of a Fermi gas near a Feshbach resonance. Using a scaling approach, whose high accuracy is proven by comparison with exact hydrodynamic solutions, the frequencies of the lowest compressional modes are calculated at T=0 in terms of a dimensionless parameter characterizing the equation of state. The predictions for the collective frequencies, obtained from the equations of state of mean field BCS theory and of recent Monte-Carlo calculations, are discussed in detail

Topics: [PHYS.COND.CM-GEN] Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other]
Publisher: American Physical Society
Year: 2005
DOI identifier: 10.1103/PhysRevLett.95.030404
OAI identifier: oai:HAL:hal-00011251v1
Provided by: Hal-Diderot
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