BCS-BEC Crossover at Finite Temperature for Superfluid Trapped Fermi Atoms

2003/11/30 by Andrea Perali, A. Perali, P. Pieri +2
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Physics of Superconductivity and Magnetism #Quantum, superfluid, helium dynamics #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.92.220404

published as Phys.Rev.Lett.92:220404,2004 · revised version, to be published in Phys. Rev. Lett

arxiv created 2004/04/29 · openalex publication_date 2004/06/04 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We consider the BCS-BEC (Bose-Einstein-condensate) crossover for a system of trapped Fermi atoms at finite temperature, both below and above the superfluid critical temperature, by including fluctuations beyond mean field. We determine the superfluid critical temperature and the pair-breaking temperature as functions of the attractive interaction between Fermi atoms, from the weak- to the strong-coupling limit (where bosonic molecules form as bound-fermion pairs). Density profiles in the trap are also obtained for all temperatures and couplings.

Citations

• Radio-Frequency Spectroscopy of Ultracold Fermions
• Magnetic Control of the Interaction in Ultracold K-Rb Mixtures
• Pairing Fluctuation Effects on the Single-Particle Spectra for the Superconducting State
• Emergence of a molecular Bose–Einstein condensate from a Fermi gas
• The pseudogap in high-temperature superconductors: an experimental survey
• Evolution from BCS superconductivity to Bose-Einstein condensation: Current correlation function in the broken-symmetry phase