{
  "id": "cond-mat/0105590",
  "version": "v1",
  "published": "2001-05-30T14:20:01.000Z",
  "updated": "2001-05-30T14:20:01.000Z",
  "title": "Observation of a new phase transition between fully and partially polarized quantum Hall states with charge and spin gaps at $ν= 2/3$",
  "authors": [
    "N. Freytag",
    "Y. Tokunaga",
    "M. Horvatic",
    "C. Berthier",
    "M. Shayegan",
    "L. Levy"
  ],
  "comment": "4 pages including 4 figures",
  "journal": "Phys. Rev. Lett. 87, 136801 (2001)",
  "doi": "10.1103/PhysRevLett.87.136801",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.str-el"
  ],
  "abstract": "The average electron spin-polarization $\\cal P$ of two-dimensional electron gas confined in $\\rm GaAs/GaAlAs$ multiple quantum-wells was measured by nuclear magnetic resonance (NMR) near the fractional quantum Hall state with filling factor $\\nu={2/3}$. Above this filling factor (${{2/3}} \\leq \\nu < 0.85$), a strong depolarization is observed corresponding to two spin flips per additional flux quantum. The most remarkable behavior of the polarization is observed at $\\nu ={{2/3}}$, where a quantum phase transition from a partially polarized (${\\cal P} \\approx {{3/4}}$) to a fully polarized (${\\cal P} = 1$) state can be driven by increasing the ratio between the Zeeman and the Coulomb energy above a critical value $\\eta_{c} = \\frac{\\Delta_{Z}}{\\Delta_{C}} = 0.0185$.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2001-05-30T14:20:01.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "partially polarized quantum hall states",
      "phase transition",
      "spin gaps",
      "observation",
      "fractional quantum hall state"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. Lett."
    },
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}