{
  "id": "0901.1183",
  "version": "v1",
  "published": "2009-01-09T08:21:40.000Z",
  "updated": "2009-01-09T08:21:40.000Z",
  "title": "Electron-electron interaction effects in quantum point contacts",
  "authors": [
    "A. M. Lunde",
    "A. De Martino",
    "A. Schulz",
    "R. Egger",
    "K. Flensberg"
  ],
  "comment": "29 pages, New Journal of Physics, in press",
  "journal": "New J. Phys. 11, 023031 (2009)",
  "doi": "10.1088/1367-2630/11/2/023031",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We consider electron-electron interaction effects in quantum point contacts on the first quantization plateau, taking into account all scattering processes. We compute the low-temperature linear and nonlinear conductance, shot noise, and thermopower, by perturbation theory and a self-consistent nonperturbative method. On the conductance plateau, the low-temperature corrections are solely due to momentum-nonconserving processes that change the relative number of left- and right-moving electrons. This leads to a suppression of the conductance for increasing temperature or voltage. The size of the suppression is estimated for a realistic saddle-point potential, and is largest in the beginning of the conductance plateau. For large magnetic field, interaction effects are strongly suppressed by the Pauli principle, and hence the first spin-split conductance plateau has a much weaker interaction correction. For the nonperturbative calculations, we use a self-consistent nonequilibrium Green's function approach, which suggests that the conductance saturates at elevated temperatures. These results are consistent with many experimental observations related to the so-called 0.7 anomaly.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2009-01-09T08:21:40.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "electron-electron interaction effects",
      "quantum point contacts",
      "self-consistent nonequilibrium greens function approach",
      "first spin-split conductance plateau",
      "large magnetic field"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "journal": "New Journal of Physics",
      "year": 2009,
      "month": "Feb",
      "volume": 11,
      "number": 2,
      "pages": "023031"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 29,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2009NJPh...11b3031L"
    }
  }
}