{
  "id": "1002.4942",
  "version": "v1",
  "published": "2010-02-26T09:01:08.000Z",
  "updated": "2010-02-26T09:01:08.000Z",
  "title": "Observation of Raman G-band splitting in top-doped few-layer graphene",
  "authors": [
    "M. Bruna",
    "S. Borini"
  ],
  "comment": "7 pages, 6 figures, to be published in PRB",
  "journal": "Phys. Rev. B 81, 125421 (2010)",
  "doi": "10.1103/PhysRevB.81.125421",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.mtrl-sci"
  ],
  "abstract": "An experimental study of Raman scattering in N-layer graphene as a function of the top layer doping is reported. At high doping level, achieved by a CHF_3 plasma treatment, we observe a splitting of the $G$ band in the spectra of bilayer and 4-layer graphene (N even), whereas the splitting is not visible in case of monolayer and trilayer graphene (N odd). The different behaviors are related to distinct electron-phonon interactions, which are affected by symmetry breaking and Fermi level position in different ways in the various N-layer graphenes. In trilayer graphene, a weakening of the electron-phonon coupling as a function of the Fermi energy induces a hardening of all zone-center in-plane optical phonon modes, like in monolayer graphene. On the other hand, in 4-layer graphene two distinct trends are observed in the G band as a function of doping, suggesting the presence of two different groups of electron-phonon interactions, like in bilayer graphene.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2010-02-26T09:01:08.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "78.30.Na",
      "63.20.K-"
    ],
    "keywords": [
      "top-doped few-layer graphene",
      "raman g-band splitting",
      "observation",
      "n-layer graphene",
      "trilayer graphene"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review B",
      "year": 2010,
      "month": "Mar",
      "volume": 81,
      "number": 12,
      "pages": 125421
    },
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2010PhRvB..81l5421B"
    }
  }
}