{
  "id": "1007.4271",
  "version": "v2",
  "published": "2010-07-24T15:28:24.000Z",
  "updated": "2010-10-26T14:38:50.000Z",
  "title": "Current noise in molecular junctions: effects of the electron-phonon interaction",
  "authors": [
    "Federica Haupt",
    "Tomas Novotny",
    "Wolfgang Belzig"
  ],
  "comment": "14 pages, 8 figures. The paper is supplemented by a Mathematica notebook with the full expressions for the lowest order corrections to the current and noise due to electron-phonon coupling. This notebook is part of the associated .tar.gz bundle",
  "journal": "Phys. Rev. B 82, 165441 (2010)",
  "doi": "10.1103/PhysRevB.82.165441",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We study inelastic effects on the electronic current noise in molecular junctions, due to the coupling between transport electrons and vibrational degrees of freedom. Using a full counting statistics approach based on the generalized Keldysh Green's function technique, we calculate in an unified manner both the mean current and the zero-frequency current noise. For multilevel junctions with weak electron-phonon coupling, we give analytical formulas for the lowest order inelastic corrections to the noise in terms of universal temperature- and voltage-dependent functions and junction-dependent prefactors, which can be evaluated microscopically, e.g. with ab-initio methodologies. We identify distinct terms corresponding to the mean-field contribution to noise and to the vertex corrections, and we show that the latter contribute substantially to the inelastic noise. Finally, we illustrate our results by a simple model of two electronic levels which are mutually coupled by the electron-phonon interaction and show that the inelastic noise spectroscopy is a sensitive diagnostic tool.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2010-10-26T14:38:50.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "72.70.+m",
      "72.10.Di",
      "85.65.+h",
      "73.63.-b"
    ],
    "keywords": [
      "molecular junctions",
      "electron-phonon interaction",
      "inelastic noise",
      "lowest order inelastic corrections",
      "generalized keldysh greens function technique"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review B",
      "year": 2010,
      "month": "Oct",
      "volume": 82,
      "number": 16,
      "pages": 165441
    },
    "note": {
      "typesetting": "TeX",
      "pages": 14,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2010PhRvB..82p5441H"
    }
  }
}