{
  "id": "1712.05648",
  "version": "v1",
  "published": "2017-12-15T12:51:59.000Z",
  "updated": "2017-12-15T12:51:59.000Z",
  "title": "Impact of Many-Body Effects on Landau Levels in Graphene",
  "authors": [
    "J. Sonntag",
    "S. Reichardt",
    "L. Wirtz",
    "B. Beschoten",
    "M. I. Katsnelson",
    "F. Libisch",
    "C. Stampfer"
  ],
  "comment": "6 pages, 3 figures",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We present magneto-Raman spectroscopy measurements on suspended graphene to investigate the charge carrier density-dependent electron-electron interaction in the presence of Landau levels. Utilizing gate-tunable magneto-phonon resonances, we extract the charge carrier density dependence of the Landau level transition energies and the associated effective Fermi velocity $v_\\mathrm{F}$. In contrast to the logarithmic divergence of $v_\\mathrm{F}$ at zero magnetic field, we find a piecewise linear scaling of $v_\\mathrm{F}$ as a function of charge carrier density, due to a magnetic field-induced suppression of the long-range Coulomb interaction. We quantitatively confirm our experimental findings by performing tight-binding calculations on the level of the Hartree-Fock approximation, which also allow us to estimate an excitonic binding energy of $\\approx$ 6 meV contained in the experimentally extracted Landau level transitions energies.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-12-15T12:51:59.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "many-body effects",
      "charge carrier density-dependent electron-electron interaction",
      "extracted landau level transitions energies"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 6,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}