{
  "id": "1202.1753",
  "version": "v2",
  "published": "2012-02-08T16:22:35.000Z",
  "updated": "2012-03-28T12:18:00.000Z",
  "title": "Transport Gap in Suspended Bilayer Graphene at Zero Magnetic Field",
  "authors": [
    "A. Veligura",
    "H. J. van Elferen",
    "N. Tombros",
    "J. C. Maan",
    "U. Zeitler",
    "B. J. van Wees"
  ],
  "comment": "8 pages, 5 figures",
  "journal": "Rhys. Rev. B (2012)",
  "doi": "10.1103/PhysRevB.85.155412",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We report a change of three orders of magnitudes in the resistance of a suspended bilayer graphene flake which varies from a few k$\\Omega$s in the high carrier density regime to several M$\\Omega$s around the charge neutrality point (CNP). The corresponding transport gap is 8 meV at 0.3 K. The sequence of appearing quantum Hall plateaus at filling factor $\\nu=2$ followed by $\\nu=1$ suggests that the observed gap is caused by the symmetry breaking of the lowest Landau level. Investigation of the gap in a tilted magnetic field indicates that the resistance at the CNP shows a weak linear decrease for increasing total magnetic field. Those observations are in agreement with a spontaneous valley splitting at zero magnetic field followed by splitting of the spins originating from different valleys with increasing magnetic field. Both, the transport gap and $B$ field response point toward spin polarized layer antiferromagnetic state as a ground state in the bilayer graphene sample. The observed non-trivial dependence of the gap value on the normal component of $B$ suggests possible exchange mechanisms in the system.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2012-03-28T12:18:00.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "73.22.Pr",
      "72.80.Vp",
      "73.43.Qt",
      "85.30.Tv"
    ],
    "keywords": [
      "zero magnetic field",
      "transport gap",
      "high carrier density regime",
      "spin polarized layer antiferromagnetic state",
      "suspended bilayer graphene flake"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review B",
      "year": 2012,
      "month": "Apr",
      "volume": 85,
      "number": 15,
      "pages": 155412
    },
    "note": {
      "typesetting": "TeX",
      "pages": 8,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2012PhRvB..85o5412V"
    }
  }
}