{
  "id": "1406.1669",
  "version": "v1",
  "published": "2014-06-06T12:46:45.000Z",
  "updated": "2014-06-06T12:46:45.000Z",
  "title": "Damping of quasiparticles in a Bose-Einstein condensate coupled to an optical cavity",
  "authors": [
    "G. Konya",
    "G. Szirmai",
    "P. Domokos"
  ],
  "categories": [
    "quant-ph",
    "cond-mat.quant-gas"
  ],
  "abstract": "We present a general theory for calculating the damping rate of elementary density wave excitations in a Bose-Einstein condensate strongly coupled to a single radiation field mode of an optical cavity. Thereby we give a detailed derivation of the huge resonant enhancement in the Beliaev damping of a density wave mode, predicted recently by K\\'onya et al., Phys.~Rev.~A 89, 051601(R) (2014). The given density-wave mode constitutes the polariton-like soft mode of the self-organization phase transition. The resonant enhancement takes place, both in the normal and ordered phases, outside the critical region. We show that the large damping rate is accompanied by a significant frequency shift of this polariton mode. Going beyond the Born-Markov approximation and determining the poles of the retarded Green's function of the polariton, we reveal a strong coupling between the polariton and a collective mode in the phonon bath formed by the other density wave modes.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-06-06T12:46:45.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "03.75.Hh",
      "37.30.+i",
      "05.30.Rt",
      "31.15.xm"
    ],
    "keywords": [
      "bose-einstein condensate",
      "optical cavity",
      "density wave mode",
      "quasiparticles",
      "single radiation field mode"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1103/PhysRevA.90.013623",
      "journal": "Physical Review A",
      "year": 2014,
      "month": "Jul",
      "volume": 90,
      "number": 1,
      "pages": "013623"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2014PhRvA..90a3623K"
    }
  }
}