Mean-Field vs. Monte Carlo equation of state for the expansion of a Fermi superfluid in the BCS-BEC crossover
Articolo
Data di Pubblicazione:
2007
Citazione:
Mean-Field vs. Monte Carlo equation of state for the expansion of a Fermi superfluid in the BCS-BEC crossover / L. Salasnich, N. Manini. - In: LASER PHYSICS. - ISSN 1054-660X. - 17:2(2007), pp. 169-173.
Abstract:
The equation of state (EOS) of a Fermi superfluid is investigated in the BCS–BEC crossover at zero
temperature. We discuss the EOS based on Monte Carlo (MC) data and asymptotic expansions and the EOS
derived from the extended BCS (EBCS) mean-field theory. Then we introduce a time-dependent density functional,
based on the bulk EOS and Landau’s superfluid hydrodynamics with a von Weizsäcker-type correction,
to study the free expansion of the Fermi superfluid. We calculate the aspect ratio and the released energy of the
expanding Fermi cloud showing that MC EOS and EBCS EOS are both compatible with the available experimental
data of
6
Li atoms. We find that the released energy satisfies an approximate analytical formula that is
quite accurate in the BEC regime. For an anisotropic droplet, our numerical simulations show an initially faster
reversal of anisotropy in the BCS regime, later suppressed by the BEC fluid.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
L. Salasnich, N. Manini
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