Thermodynamics of a trapped unitary Fermi gas
arXiv:0805.3226 · doi:10.1103/PhysRevA.78.063602
Abstract
Thermodynamic properties of an ultracold Fermi gas in a harmonic trap are calculated within a local density approximation, using a conserving many-body formalism for the BCS to BEC crossover problem, which has been developed by Haussmann et al. [Phys. Rev. A 75, 023610 (2007)]. We focus on the unitary regime near a Feshbach resonance and determine the local density and entropy profiles and the global entropy S(E) as a function of the total energy E. Our results are in good agreement with both experimental data and previous analytical and numerical results for the thermodynamics of the unitary Fermi gas. The value of the Bertsch parameter at T=0 and the superfluid transition temperature, however, differ appreciably. We show that, well in the superfluid regime, removal of atoms near the cloud edge enables cooling far below temperatures that have been reached so far.
10 pages, 5 figures
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Cited by in corpus (13)
- Bragg spectroscopy of a strongly interacting Fermi gas
- Thermodynamic Measurements in a Strongly Interacting Fermi Gas
- Two-Element Mixture of Bose and Fermi Superfluids
- When Superconductivity Crosses Over: From BCS to BEC
- Critical Behaviour in Trapped Strongly Interacting Fermi Gases
- Beyond-mean-field description of a trapped unitary Fermi gas with mass and population imbalance
- Normal-Superfluid Interface for Polarized Fermion Gases
- The finite-temperature thermodynamics of a trapped unitary Fermi gas within fractional exclusion statistics
- Spin susceptibility and effects of a harmonic trap in the BCS-BEC crossover regime of an ultracold Fermi gas
- Irreversible entropy transport enhanced by fermionic superfluidity
- Adiabatic cooling of a tunable Bose-Fermi mixture in an optical lattice
- Triplet pair amplitude in a trapped -wave superfluid Fermi gas with broken spin rotation symmetry. II. Three dimensional continuum case
- Statistical mechanics of a Feshbach coupled Bose-Fermi gas in an optical lattice