2006/04/25 by Massimo Mannarelli, Giuseppe Nardulli, Marco Ruggieri · 1 citation
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #cond-mat.supr-con #hep-ph
paper · pdf · doi:10.1103/physreva.74.033606
published as Phys.Rev.A74:033606,2006 · 9 pages, 5 figures
arxiv created 2006/04/25 · openalex publication_date 2006/09/11 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The phase diagram of a nonrelativistic fermionic system with imbalanced state populations interacting via a short-range S-wave attractive interaction is analyzed in the mean-field approximation. We determine the energetically favored state for different values of the mismatch between the two Fermi spheres in the weak- and strong-coupling regimes considering both homogeneous and nonhomogeneous superconductive states. We find that the homogeneous superconductive phase persists for values of the population imbalance that increase with increasing coupling strength. In the strong-coupling regime and for large population differences the energetically stable homogeneous phase is characterized by one gapless mode. We also find that the inhomogeneous superconductive phase characterized by the condensate \ensuremathΔ(x)\ensuremath∼\ensuremathΔ\phantom\rule0.2em0exexp(iq∙x) is energetically favored in a range of values of the chemical-potential mismatch that shrinks to zero in the strong-coupling regime.