{
  "id": "cond-mat/0603011",
  "version": "v2",
  "published": "2006-03-01T08:26:39.000Z",
  "updated": "2006-06-20T01:59:40.000Z",
  "title": "BCS-BEC crossover in an asymmetric two-component Fermi gas",
  "authors": [
    "Xia-Ji Liu",
    "Hui Hu"
  ],
  "comment": "7 pages + 3 figures; To appear in Europhysics Letters",
  "journal": "Europhys. Lett. 75, 364 (2006)",
  "doi": "10.1209/epl/i2006-10136-3",
  "categories": [
    "cond-mat.stat-mech",
    "cond-mat.supr-con"
  ],
  "abstract": "We discuss the superfluid phase transition of a strongly interacting Fermi gas with unequal (asymmetric) chemical potentials in two pairing hyperfine states, and map out its phase diagram near the BCS-BEC crossover. Our approach includes the fluctuation contributions of {}``preformed Cooper pairs'' to the thermodynamic potential at finite temperature. We show that, below a critical difference in chemical potentials between species, a normal gas is unstable towards the formation of either a finite-momentum paired Fulde-Ferrell-Larkin-Ovchinnikov superconducting phase or a uniform superfluid, depending on the asymmetry and interaction strengths. We determine the value of critical chemical potential mismatch, and find good qualitative agreement with a recent measurement by Zwierlein \\textit{et al.} {[}Science \\textbf{311}, 492 (2006){]}.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2006-06-20T01:59:40.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "asymmetric two-component fermi gas",
      "bcs-bec crossover",
      "chemical potential",
      "finite-momentum paired fulde-ferrell-larkin-ovchinnikov superconducting phase",
      "superfluid phase transition"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}