{
  "id": "cond-mat/9709323",
  "version": "v1",
  "published": "1997-09-29T16:38:40.000Z",
  "updated": "1997-09-29T16:38:40.000Z",
  "title": "Linear density response in the random phase approximation for confined Bose vapours at finite temperature",
  "authors": [
    "A. Minguzzi",
    "M. P. Tosi"
  ],
  "comment": "14 pages. To appear on J. Phys. : Condens. Matter",
  "journal": "J. Phys: Condens. Matter vol. 9, p. 10211 (1997)",
  "doi": "10.1088/0953-8984/9/46/019",
  "categories": [
    "cond-mat.stat-mech"
  ],
  "abstract": "A linear response framework is set up for the evaluation of collective excitations in a confined vapour of interacting Bose atoms at finite temperature. Focusing on the currently relevant case of contact interactions between the atoms, the theory is developed within a random phase approximation with exchange. This approach is naturally introduced in a two-fluid description by expressing the density response of both the condensate and the non-condensate in terms of the response of a Hartree-Fock reference gas to the selfconsistent Hartree-Fock potentials. Such an approximate account of correlations (i) preserves an interplay between the condensate and the non-condensate through off-diagonal components of the response, which instead vanish in the Hartree-Fock-Bogolubov approximation; and (ii) yields a common resonant structure for the four partial response functions. The theory reduces to the temperature-dependent Hartree-Fock-Bogolubov-Popov approximation for the fluctuations of the condensate when its coupling with the density fluctuations of the non-condensate is neglected. Analytic results are presented which are amenable to numerical calculations and to inclusion of damping rates.",
  "revisions": [
    {
      "version": "v1",
      "updated": "1997-09-29T16:38:40.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "random phase approximation",
      "linear density response",
      "confined bose vapours",
      "finite temperature",
      "temperature-dependent hartree-fock-bogolubov-popov approximation"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 14,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}