2002/01/15 by Yoji Ohashi, Y. Ohashi, Allan Griffin +1 · 1 citation
Physics and Astronomy · #Atomic physics #BCS theory #Boson #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Cooper pair #Degenerate energy levels #Fermi Gamma-ray Space Telescope #Fermi gas #Fermion #Feshbach resonance #Hyperfine structure #Molecule #Pairing #Phase transition #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Quantum, superfluid, helium dynamics #Resonance (particle physics) #Superconductivity #Superfluidity #cond-mat.mtrl-sci #cond-mat.soft #cond-mat.stat-mech #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.89.130402
12 pages, 3 figures
arxiv created 2002/01/15 · openalex publication_date 2002/09/05 · arxiv updated 2016/08/31 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We discuss the BCS-BEC crossover in a degenerate Fermi gas of two hyperfine states interacting close to a Feshbach resonance. We show that, by including fluctuation contributions to the free energy similar to that considered by Nozières and Schmitt-Rink, the character of the superfluid phase transition continuously changes from the BCS-type to the BEC-type, as the threshold of the quasimolecular band is lowered. In the BEC regime, the superfluid phase transition is interpreted in terms of molecules associated with both the Feshbach resonance and Cooper pairing.