Expansion of a Fermi cloud in the BCS-BEC crossover

Journal Article · Thu Jun 15 04:00:00 EDT 2006 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.73.0· OSTI ID:20787609

Diana, G; Manini, N ^[1]; Salasnich, L ^[1]

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1. Dipartimento di Fisica and CNR-INFM, Universita di Milano, Via Celoria 16, 20133 Milan (Italy)

We study the free expansion of a dilute two-component Fermi gas with attractive interspecies interaction in the Bardeen-Cooper-Schrieffer-Bose-Einstein condensate (BCS-BEC) crossover. We apply a time-dependent parameter-free density-functional theory by using two choices of the equation of state: an analytic formula based on Monte Carlo data and the mean-field equation of state resulting from the extended BCS equations. The calculated axial and transverse radii and the aspect ratio of the expanding cloud are compared to experimental data on vapors of {sup 6}Li atoms. Remarkably, the mean-field theory shows a better agreement with the experiments than the theory based on the Monte Carlo equation of state. Both theories predict a measurable dependence of the aspect ratio on expansion time and on scattering length.

• OSTI ID: 20787609
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 73; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ASPECT RATIO
ATOMS
BCS THEORY
BOSE-EINSTEIN CONDENSATION
DENSITY FUNCTIONAL METHOD
EQUATIONS OF STATE
FERMI GAS
FERMIONS
LITHIUM 6
MEAN-FIELD THEORY
MONTE CARLO METHOD
SCATTERING LENGTHS
TIME DEPENDENCE
VAPORS