{
  "id": "1009.1713",
  "version": "v2",
  "published": "2010-09-09T09:14:24.000Z",
  "updated": "2010-10-20T16:18:33.000Z",
  "title": "Transmission coefficient through a saddle-point electrostatic potential for graphene in the quantum Hall regime",
  "authors": [
    "Martina Flöser",
    "Thierry Champel",
    "Serge Florens"
  ],
  "comment": "4 pages, 2 figures Minor modifications as published",
  "journal": "Phys. Rev. B 82,161408 (2010)",
  "doi": "10.1103/PhysRevB.82.161408",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "From the scattering of semicoherent-state wavepackets at high magnetic field, we derive analytically the transmission coefficient of electrons in graphene in the quantum Hall regime through a smooth constriction described by a quadratic saddle-point electrostatic potential. We find anomalous half-quantized conductance steps that are rounded by a backscattering amplitude related to the curvature of the potential. Furthermore, the conductance in graphene breaks particle-hole symmetry in cases where the saddle-point potential is itself asymmetric in space. These results have implications both for the interpretation of split-gate transport experiments, and for the derivation of quantum percolation models for graphene.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2010-10-20T16:18:33.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "73.43.Jn",
      "73.43.Cd",
      "71.70.Di",
      "73.22.Pr"
    ],
    "keywords": [
      "quantum hall regime",
      "transmission coefficient",
      "quadratic saddle-point electrostatic potential",
      "graphene breaks particle-hole symmetry",
      "high magnetic field"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review B",
      "year": 2010,
      "month": "Oct",
      "volume": 82,
      "number": 16,
      "pages": 161408
    },
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2010PhRvB..82p1408F"
    }
  }
}