{
  "id": "1004.4042",
  "version": "v1",
  "published": "2010-04-23T02:24:02.000Z",
  "updated": "2010-04-23T02:24:02.000Z",
  "title": "Room-temperature Tunable Fano Resonance by Chemical Doping in Few-layer Graphene Synthesized by Chemical Vapor Deposition",
  "authors": [
    "Zhihong Liu",
    "Xiaoxiang Lu",
    "Peng Peng",
    "Wei Wu",
    "Steven Pei",
    "Qingkai Yu",
    "Jiming Bao"
  ],
  "comment": "14 pages, 4 figures",
  "doi": "10.1103/PhysRevB.82.155435",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.mtrl-sci"
  ],
  "abstract": "A Fano-like phonon resonance is observed in few-layer (~3) graphene at room temperature using infrared Fourier transform spectroscopy. This Fano resonance is the manifestation of a strong electron-phonon interaction between the discrete in-plane lattice vibrational mode and continuum electronic excitations in graphene. By employing ammonia chemical doping, we have obtained different Fano line shapes ranging from anti-resonance in hole-doped graphene to phonon-dominated in n-type graphene. The Fano resonance shows the strongest interference feature when the Fermi level is located near the Dirac point. The charged phonon exhibits much-enhanced oscillator strength and experiences a continuous red shift in frequency as electron density increases. It is suggested that the phonon couples to different electronic transitions as Fermi level is tuned by chemical doping.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2010-04-23T02:24:02.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "73.22.Pr",
      "78.30.-j",
      "78.67.Wj"
    ],
    "keywords": [
      "room-temperature tunable fano resonance",
      "chemical vapor deposition",
      "few-layer graphene",
      "chemical doping",
      "discrete in-plane lattice vibrational mode"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review B",
      "year": 2010,
      "month": "Oct",
      "volume": 82,
      "number": 15,
      "pages": 155435
    },
    "note": {
      "typesetting": "TeX",
      "pages": 14,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2010PhRvB..82o5435L"
    }
  }
}