{
  "id": "0903.1931",
  "version": "v1",
  "published": "2009-03-11T09:04:33.000Z",
  "updated": "2009-03-11T09:04:33.000Z",
  "title": "The effect of population imbalance on the Berezinskii-Kosterlitz-Thouless phase transition in a superfluid Fermi gas",
  "authors": [
    "J. Tempere",
    "S. N. Klimin",
    "J. T. Devreese"
  ],
  "comment": "3 figures",
  "journal": "Phys. Rev. A 79, 053637 (2009)",
  "doi": "10.1103/PhysRevA.79.053637",
  "categories": [
    "cond-mat.stat-mech",
    "cond-mat.other"
  ],
  "abstract": "The Berezinskii-Kosterlitz-Thouless (BKT) mechanism describes the breakdown of superfluidity in a two-dimensional Bose gas or a two-dimensional gas of paired fermions. In the latter case, a population imbalance between the two pairing partners in the Fermi mixture is known to influence pairing characteristics. Here, we investigate the effects of imbalance on the two-dimensional BKT superfluid transition, and show that superfluidity is even more sensitive to imbalance than for three dimensional systems. Finite-temperature phase diagrams are derived using the functional integral formalism in combination with a hydrodynamic action functional for the phase fluctuations. This allow to identify a phase separation region and tricritical points due to imbalance. In contrast to superfluidity in the three-dimensional case, the effect of imbalance is also pronounced in the strong-coupling regime.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2009-03-11T09:04:33.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "03.75.Ss",
      "05.30.Fk",
      "03.75.Lm"
    ],
    "keywords": [
      "superfluid fermi gas",
      "berezinskii-kosterlitz-thouless phase transition",
      "population imbalance",
      "two-dimensional bkt superfluid transition",
      "phase separation region"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review A",
      "year": 2009,
      "month": "May",
      "volume": 79,
      "number": 5,
      "pages": "053637"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2009PhRvA..79e3637T"
    }
  }
}