{
  "id": "0801.1504",
  "version": "v4",
  "published": "2008-01-09T20:58:39.000Z",
  "updated": "2009-11-22T20:23:19.000Z",
  "title": "The Finite Temperature Pairing Gap of a Unitary Fermi Gas by Quantum Monte Carlo Calculations",
  "authors": [
    "P. Magierski",
    "G. Wlazlowski",
    "A. Bulgac",
    "J. E. Drut"
  ],
  "comment": "4 pages, 5 figures. Published version",
  "journal": "Phys. Rev. Lett. 103, 210403 (2009)",
  "doi": "10.1103/PhysRevLett.103.210403",
  "categories": [
    "cond-mat.stat-mech",
    "nucl-th"
  ],
  "abstract": "We calculate the one-body temperature Green's (Matsubara) function of the unitary Fermi gas via Quantum Monte Carlo, and extract the spectral weight function $A(p,\\omega)$ using the methods of maximum entropy and singular value decomposition. From $A(p,\\omega)$ we determine the quasiparticle spectrum, which can be accurately parametrized by three functions of temperature: an effective mass $m^*$, a mean-field potential $U$, and a gap $\\Delta$. Below the critical temperature $T_c=0.15\\varepsilon_F$ the results for $m^*$, $U$ and $\\Delta$ can be accurately reproduced using an independent quasiparticle model. We find evidence of a pseudogap in the fermionic excitation spectrum for temperatures up to {$T^*\\approx 0.20\\varepsilon_{F} > T_c$}.",
  "revisions": [
    {
      "version": "v4",
      "updated": "2009-11-22T20:23:19.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "05.30.Fk",
      "67.25.dt",
      "03.75.Hh",
      "03.75.Ss"
    ],
    "keywords": [
      "quantum monte carlo calculations",
      "finite temperature pairing gap",
      "unitary fermi gas"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review Letters",
      "year": 2009,
      "month": "Nov",
      "volume": 103,
      "number": 21,
      "pages": 210403
    },
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 809325,
      "adsabs": "2009PhRvL.103u0403M"
    }
  }
}