{
  "id": "1302.1444",
  "version": "v2",
  "published": "2013-02-06T17:29:49.000Z",
  "updated": "2017-08-07T13:52:41.000Z",
  "title": "Observation of an anomalous density-dependent energy gap of the $ν=5/2$ fractional quantum Hall state in the low density regime",
  "authors": [
    "N. Samkharadze",
    "Dohyung Ro",
    "L. N. Pfeiffer",
    "K. W. West",
    "G. A. Csáthy"
  ],
  "journal": "PRB 96, 085105 (2017)",
  "doi": "10.1103/PhysRevB.96.085105",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.str-el"
  ],
  "abstract": "We have studied the $\\nu=5/2$ fractional quantum Hall state in a density-tunable sample at extremely low electron densities. For the densities accessed in our experiment, the Landau level mixing parameter $\\kappa$ spans the $2.52<\\kappa<2.82$ range. In the vicinity of $5.8 \\times 10^{10}$~cm$^{-2}$ or $\\kappa = 2.6$ an anomalously large change in the density dependence of the energy gap is observed. Possible origins of such an anomaly are discussed, including a topological phase transition in the $\\nu=5/2$ fractional quantum Hall state.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2013-02-06T17:29:49.000Z",
      "title": "Observation of a Transition in the $ν=5/2$ Fractional Quantum Hall State at Large Landau Level Mixing",
      "abstract": "We have studied the $\\nu=5/2$ fractional quantum Hall state in the regime of extremely low densities, for which the Landau level mixing parameter $\\kappa$ spans the so far unexplored $2.52<\\kappa<2.82$ range. In the vicinity of $\\kappa = 2.6$ an unexpectedly large change in the density dependence of the energy gap is observed which is suggestive of a transition in the $\\nu=5/2$ state. Origins of such a transition are discussed, including the possibility of a topological phase transition.",
      "comment": null,
      "journal": null,
      "doi": null,
      "authors": [
        "N. Samkharadze",
        "L. N. Pfeiffer",
        "K. W. West",
        "G. A. Csáthy"
      ]
    },
    {
      "version": "v2",
      "updated": "2017-08-07T13:52:41.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "fractional quantum hall state",
      "large landau level mixing",
      "transition",
      "observation",
      "landau level mixing parameter"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. B"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2013arXiv1302.1444S"
    }
  }
}