{
  "id": "1204.1702",
  "version": "v1",
  "published": "2012-04-08T03:30:42.000Z",
  "updated": "2012-04-08T03:30:42.000Z",
  "title": "Observation of out-of-plane vibrations in few-layer graphene",
  "authors": [
    "Chun Hung Lui",
    "Leandro M. Malard",
    "SukHyun Kim",
    "Gabriel Lantz",
    "François E. Laverge",
    "Riichiro Saito",
    "Tony F. Heinz"
  ],
  "comment": "17 pages, 7 figures, supplemental material included",
  "journal": "Nano Letters, 12, 5539 (2012)",
  "doi": "10.1021/nl302450s",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We report the observation of layer breathing mode (LBM) vibrations in few-layer graphene (FLG) samples of thickness from 2 to 6 layers, exhibiting both Bernal (AB) and rhombohedral (ABC) stacking order. The LBM vibrations are identified using a Raman combination band lying around 1720 cm-1. From double resonance theory, we identify the feature as the LOZO' combination mode of the out-of-plane LBM (ZO') and the in-plane longitudinal optical mode (LO). The LOZO' Raman band is found to exhibit multiple peaks, with a unique line shape for each layer thickness and stacking order. These complex line shapes of the LOZO'-mode arise both from the material-dependent selection of different phonons in the double-resonance Raman process and from the detailed structure of the different branches of LBM in FLG.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2012-04-08T03:30:42.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "few-layer graphene",
      "out-of-plane vibrations",
      "observation",
      "complex line shapes",
      "stacking order"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 17,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2012arXiv1204.1702L"
    }
  }
}