{
  "id": "1408.0672",
  "version": "v2",
  "published": "2014-08-04T13:09:09.000Z",
  "updated": "2014-08-06T11:17:07.000Z",
  "title": "Origin of coherent G band phonon spectra in single wall carbon nanotubes",
  "authors": [
    "A. R. T. Nugraha",
    "E. H. Hasdeo",
    "G. D. Sanders",
    "C. J. Stanton",
    "R. Saito"
  ],
  "comment": "submitted to Phys. Rev. B",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "Coherent phonons in single wall carbon nanotubes (SWNTs) are observed as oscillations of the differential absorption coefficient as a function of time by means of pump-probe spectroscopy. For the radial breathing mode (RBM) of a SWNT, the coherent phonon signal is understood to be a result of the modulated diameter-dependent energy gaps due to the coherent RBM phonon oscillations. However, this mechanism might not be the dominant contribution to other phonon modes in the SWNT. In particular, for the G band phonons, which correspond to bond-stretching motions, we find that the modulation of the interatomic dipole matrix element gives rise to a strong coherent G band phonon intensity comparable to the coherent RBM phonon intensity. We also further discuss the dependence of coherent G band and RBM phonon amplitudes on the laser excitation pulse width.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2014-08-06T11:17:07.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "78.67.Ch",
      "78.47.J-",
      "73.22.-f",
      "63.22.Gh"
    ],
    "keywords": [
      "single wall carbon nanotubes",
      "band phonon spectra",
      "coherent rbm phonon intensity",
      "coherent phonon",
      "laser excitation pulse width"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1103/PhysRevB.91.045406",
      "journal": "Physical Review B",
      "year": 2015,
      "month": "Jan",
      "volume": 91,
      "number": 4,
      "pages": "045406"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2015PhRvB..91d5406N"
    }
  }
}