{
  "id": "1106.5631",
  "version": "v1",
  "published": "2011-06-28T11:45:15.000Z",
  "updated": "2011-06-28T11:45:15.000Z",
  "title": "Real-time switching between multiple steady-states in quantum transport",
  "authors": [
    "A. -M. Uimonen",
    "E. Khosravi",
    "G. Stefanucci",
    "S. Kurth",
    "R. van Leeuwen",
    "E. K. U. Gross"
  ],
  "comment": "10 pages, 8 figures, Submitted at \"Progress in Nonequilibrium Green's Functions IV\" conference",
  "journal": "Journal of Physics, Conf. Ser. 220, 012018 (2010)",
  "doi": "10.1088/1742-6596/220/1/012018",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We study transport through an interacting model system consisting of a central correlated site coupled to finite bandwidth tight-binding leads, which are considered as effectively noninteracting. Its nonequilibrium properties are determined by real-time propagation of the Kadanoff-Baym equations after applying a bias voltage to the system. The electronic interactions on the central site are incorporated by means of self-energy approximations at Hartree-Fock, second Born and GW level. We investigate the conditions under which multiple steady-state solutions occur within different self-energy approximations, and analyze in detail the nature of these states from an analysis of their spectral functions. At the Hartree-Fock level at least two stable steady-state solutions with different densities and currents can be found. By applying a gate voltage-pulse at a given time we are able to switch between these solutions. With the same parameters we find only one steady-state solution when the self-consistent second Born and GW approximations are considered. We therefore conclude that treatment of many-body interactions beyond mean-field can destroy bistability and lead to qualitatively different results as compared those at mean-field level.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2011-06-28T11:45:15.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "quantum transport",
      "real-time switching",
      "multiple steady-state solutions occur",
      "self-energy approximations",
      "self-consistent second born"
    ],
    "tags": [
      "conference paper",
      "journal article"
    ],
    "publication": {
      "journal": "Journal of Physics Conference Series",
      "year": 2010,
      "month": "Apr",
      "volume": 220,
      "number": 1,
      "pages": "012018"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 10,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2010JPhCS.220a2018U"
    }
  }
}