{
  "id": "0902.4550",
  "version": "v1",
  "published": "2009-02-26T11:06:17.000Z",
  "updated": "2009-02-26T11:06:17.000Z",
  "title": "Polaron relaxation in a quantum dot due to anharmonic coupling within a mean-field approach",
  "authors": [
    "T. Stauber",
    "M. I. Vasilevskiy"
  ],
  "comment": "5 pages, 1 figure",
  "journal": "Phys. Rev. B 79, 113301 (2009)",
  "doi": "10.1103/PhysRevB.79.113301",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We study the electronic relaxation in a quantum dot within the polaron approach, by focusing on the {\\it reversible} anharmonic decay of longitudinal optical (LO) phonons forming the polaron into longitudinal acoustic (LA) phonons. The coherent coupling between the LO and LA phonons is treated within a mean-field approach. We derive a temperature-dependent inter-level coupling parameter, related to the Gr\\\"uneisen parameter and the thermal expansion coefficient, that characterizes an effective decay channel for the electronic (or excitonic) states. Within this theory, we obtain a characteristic anharmonic decay time of 1ns, 2-3 orders of magnitude longer than previous predictions based on the Fermi's Golden Rule. We suggest that coherent relaxation due to carrier-carrier interaction is an efficient alternative to the (too slow) polaron decay.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2009-02-26T11:06:17.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "78.67.Hc",
      "71.38.-k",
      "73.61.Ey",
      "73.61.Ga"
    ],
    "keywords": [
      "quantum dot",
      "mean-field approach",
      "polaron relaxation",
      "anharmonic coupling",
      "characteristic anharmonic decay time"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review B",
      "year": 2009,
      "month": "Mar",
      "volume": 79,
      "number": 11,
      "pages": 113301
    },
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2009PhRvB..79k3301S"
    }
  }
}