{
  "id": "0909.2175",
  "version": "v2",
  "published": "2009-09-11T14:11:40.000Z",
  "updated": "2010-03-09T00:50:49.000Z",
  "title": "Many-body effects on the $ρ_{xx}$ ringlike structures in two-subband wells",
  "authors": [
    "Gerson J. Ferreira",
    "Henrique J. P. Freire",
    "J. Carlos Egues"
  ],
  "comment": "4 pages, 3 figures",
  "journal": "Phys. Rev. Lett. 104, 066803 (2010)",
  "doi": "10.1103/PhysRevLett.104.066803",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "The longitudinal resistivity $\\rho_{xx}$ of two-dimensional electron gases formed in wells with two subbands displays ringlike structures when plotted in a density--magnetic-field diagram, due to the crossings of spin-split Landau levels (LLs) from distinct subbands. Using spin density functional theory and linear response, we investigate the shape and spin polarization of these structures as a function of temperature and magnetic-field tilt angle. We find that (i) some of the rings \"break\" at sufficiently low temperatures due to a quantum Hall ferromagnetic phase transition, thus exhibiting a high degree of spin polarization ($\\sim 50 $%) within, consistent with the NMR data of Zhang \\textit{et al.} [Phys. Rev. Lett. {\\bf 98}, 246802 (2007)], and (ii) for increasing tilting angles the interplay between the anticrossings due to inter-LL couplings and the exchange-correlation (XC) effects leads to a collapse of the rings at some critical angle $\\theta_c$, in agreement with the data of Guo \\textit{et al.} [Phys. Rev. B {\\bf 78}, 233305 (2008)].",
  "revisions": [
    {
      "version": "v2",
      "updated": "2010-03-09T00:50:49.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "73.43.Qt",
      "71.15.Mb",
      "73.43.Nq"
    ],
    "keywords": [
      "many-body effects",
      "two-subband wells",
      "quantum hall ferromagnetic phase transition",
      "spin polarization",
      "spin density functional theory"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review Letters",
      "year": 2010,
      "month": "Feb",
      "volume": 104,
      "number": 6,
      "pages": "066803"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2010PhRvL.104f6803F"
    }
  }
}