{
  "id": "1007.2605",
  "version": "v2",
  "published": "2010-07-15T16:18:16.000Z",
  "updated": "2010-10-12T11:52:36.000Z",
  "title": "What is measured in the scanning gate microscopy of a quantum point contact?",
  "authors": [
    "Rodolfo A. Jalabert",
    "Wojciech Szewc",
    "Steven Tomsovic",
    "Dietmar Weinmann"
  ],
  "comment": "4 pages, 1 figure, final version",
  "journal": "Phys. Rev. Lett. 105, 166802 (2010)",
  "doi": "10.1103/PhysRevLett.105.166802",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "The conductance change due to a local perturbation in a phase-coherent nanostructure is calculated. The general expressions to first and second order in the perturbation are applied to the scanning gate microscopy of a two-dimensional electron gas containing a quantum point contact. The first-order correction depends on two scattering states with electrons incoming from opposite leads and is suppressed on a conductance plateau; it is significant in the step regions. On the plateaus, the dominant second-order term likewise depends on scattering states incoming from both sides. It is always negative, exhibits fringes, and has a spatial decay consistent with experiments.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2010-10-12T11:52:36.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "85.35.Ds",
      "07.79.-v",
      "72.10.-d",
      "73.23.-b"
    ],
    "keywords": [
      "quantum point contact",
      "scanning gate microscopy",
      "dominant second-order term likewise depends",
      "two-dimensional electron gas",
      "first-order correction depends"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review Letters",
      "year": 2010,
      "month": "Oct",
      "volume": 105,
      "number": 16,
      "pages": 166802
    },
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2010PhRvL.105p6802J"
    }
  }
}