{
  "id": "1005.2293",
  "version": "v1",
  "published": "2010-05-13T10:43:41.000Z",
  "updated": "2010-05-13T10:43:41.000Z",
  "title": "Probing the electron-phonon coupling in ozone-doped graphene by Raman spectroscopy",
  "authors": [
    "F. Alzina",
    "H. Tao",
    "J. Moser",
    "Y. Garcia",
    "A. Bachtold",
    "C. M. Sotomayor-Torres"
  ],
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We have investigated the effects of ozone treatment on graphene by Raman scattering. Sequential ozone short-exposure cycles resulted in increasing the $p$ doping levels as inferred from the blue shift of the 2$D$ and $G$ peak frequencies, without introducing significant disorder. The two-phonon 2$D$ and 2$D'$ Raman peak intensities show a significant decrease, while, on the contrary, the one-phonon G Raman peak intensity remains constant for the whole exposure process. The former reflects the dynamics of the photoexcited electrons (holes) and, specifically, the increase of the electron-electron scattering rate with doping. From the ratio of 2$D$ to 2$D$ intensities, which remains constant with doping, we could extract the ratio of electron-phonon coupling parameters. This ratio is found independent on the number of layers up to ten layers. Moreover, the rate of decrease of 2$D$ and 2$D'$ intensities with doping was found to slowdown inversely proportional to the number of graphene layers, revealing the increase of the electron-electron collision probability.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2010-05-13T10:43:41.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "63.20.kd",
      "63.22.Rc",
      "78.30.-j",
      "78.67.Wj"
    ],
    "keywords": [
      "electron-phonon coupling",
      "raman spectroscopy",
      "ozone-doped graphene",
      "ozone short-exposure cycles",
      "raman peak intensity remains constant"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1103/PhysRevB.82.075422",
      "journal": "Physical Review B",
      "year": 2010,
      "month": "Aug",
      "volume": 82,
      "number": 7,
      "pages": "075422"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2010PhRvB..82g5422A"
    }
  }
}