{
  "id": "0904.1996",
  "version": "v3",
  "published": "2009-04-13T19:51:52.000Z",
  "updated": "2009-09-04T21:14:34.000Z",
  "title": "Breakdown of the N=0 Quantum Hall State in graphene: two insulating regimes",
  "authors": [
    "L. Zhang",
    "J. Camacho",
    "H. Cao",
    "Y. P. Chen",
    "M. Khodas",
    "D. Kharzeev",
    "A. Tsvelik",
    "T. Valla",
    "I. A. Zaliznyak"
  ],
  "comment": "4 pages, 4 figures, revised version",
  "journal": "Phys. Rev. B 80, 241412 (2009)",
  "doi": "10.1103/PhysRevB.80.241412",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.str-el"
  ],
  "abstract": "We studied the unusual Quantum Hall Effect (QHE) near the charge neutrality point (CNP) in high-mobility graphene sample for magnetic fields up to 18 T. We observe breakdown of the delocalized QHE transport and strong increase in resistivities $\\rho_{xx},|\\rho_{xy}|$ with decreasing Landau level filling for $\\nu < 2$, where we identify two insulating regimes. For $1 \\gtrsim |\\nu| \\gtrsim 1/2$ we find an exponential increase of $\\rho_{xx,xy} \\sim e^{a(H-H_c)}$ within the range up to several resistance quanta $R_K$, while the Hall effect gradually disappears, consistent with the Hall insulator (HI) with local transport. Then, at $\\nu \\approx 1/2$ a cusp in $\\rho_{xx}(H)$ followed by an onset of even faster growth indicates transition to a collective insulator (CI) state. The likely candidate for this state is a pinned Wigner crystal.",
  "revisions": [
    {
      "version": "v3",
      "updated": "2009-09-04T21:14:34.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "73.43.-f",
      "71.70.Di",
      "73.63.-b"
    ],
    "keywords": [
      "quantum hall state",
      "insulating regimes",
      "unusual quantum hall effect",
      "charge neutrality point",
      "high-mobility graphene sample"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review B",
      "year": 2009,
      "month": "Dec",
      "volume": 80,
      "number": 24,
      "pages": 241412
    },
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2009PhRvB..80x1412Z"
    }
  }
}