{
  "id": "0808.0906",
  "version": "v3",
  "published": "2008-08-06T18:22:11.000Z",
  "updated": "2009-03-31T21:39:52.000Z",
  "title": "Divergent resistance at the Dirac point in graphene: Evidence for a transition in a high magnetic field",
  "authors": [
    "Joseph G. Checkelsky",
    "Lu Li",
    "N. P. Ong"
  ],
  "comment": "7 pages, 9 figures. Slight change in title, 1 new figure (9) and revised text",
  "journal": "Phys. Rev. B 79, 115434 (2009)",
  "doi": "10.1103/PhysRevB.79.115434",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.str-el"
  ],
  "abstract": "We have investigated the behavior of the resistance of graphene at the $n=0$ Landau Level in an intense magnetic field $H$. Employing a low-dissipation technique (with power $P<$3 fW), we find that, at low temperature $T$, the resistance at the Dirac point $R_0(H)$ undergoes a 1000-fold increase from $\\sim$10 k$\\Omega$ to 40 M$\\Omega$ within a narrow interval of field. The abruptness of the increase suggests that a transition to an insulating, ordered state occurs at the critical field $H_c$. Results from 5 samples show that $H_c$ depends systematically on the disorder, as measured by the offset gate voltage $V_0$. Samples with small $V_0$ display a smaller critical field $H_c$. Empirically, the steep increase in $R_0$ fits acccurately a Kosterlitz-Thouless-type correlation length over 3 decades. The curves of $R_0$ vs. $T$ at fixed $H$ approach the thermal-activation form with a gap $\\Delta\\sim$15 K as $H\\to H_c^{-}$, consistent with a field-induced insulating state.",
  "revisions": [
    {
      "version": "v3",
      "updated": "2009-03-31T21:39:52.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "73.63.-b",
      "73.21.-b",
      "73.43.-f"
    ],
    "keywords": [
      "high magnetic field",
      "dirac point",
      "divergent resistance",
      "transition",
      "kosterlitz-thouless-type correlation length"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review B",
      "year": 2009,
      "month": "Mar",
      "volume": 79,
      "number": 11,
      "pages": 115434
    },
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2009PhRvB..79k5434C"
    }
  }
}