Variable Electron-Phonon Coupling in Isolated Metallic Carbon Nanotubes Observed by Raman Scattering

Yang Wu; Janina Maultzsch; Ernst Knoesel; Bhupesh Chandra; Mingyuan Huang; Matthew Y. Sfeir; Louis E. Brus; J. Hone; Tony F. Heinz

doi:10.1103/PhysRevLett.99.027402

Variable Electron-Phonon Coupling in Isolated Metallic Carbon Nanotubes Observed by Raman Scattering

Materials Science 2011-11-10 v1

Authors: Yang Wu , Janina Maultzsch , Ernst Knoesel , Bhupesh Chandra , Mingyuan Huang , Matthew Y. Sfeir , Louis E. Brus , J. Hone , Tony F. Heinz

Journal reference: Phys. Rev. Lett. 99, 027402 (2007)

Comments: 13 pages; submitted to Phys. Rev. Lett

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Abstract

We report the existence of broad and weakly asymmetric features in the high-energy (G) Raman modes of freely suspended metallic carbon nanotubes of defined chiral index. A significant variation in peak width (from 12 cm-1 to 110 cm-1) is observed as a function of the nanotube's chiral structure. When the nanotubes are electrostatically gated, the peak widths decrease. The broadness of the Raman features is understood as the consequence of coupling of the phonon to electron-hole pairs, the strength of which varies with the nanotube chiral index and the position of the Fermi energy.

Keywords

raman spectroscopy carbon nanotubes phonon modes and lattice dynamics

Cite

@article{arxiv.0705.3986,
  title  = {Variable Electron-Phonon Coupling in Isolated Metallic Carbon Nanotubes Observed by Raman Scattering},
  author = {Yang Wu and Janina Maultzsch and Ernst Knoesel and Bhupesh Chandra and Mingyuan Huang and Matthew Y. Sfeir and Louis E. Brus and J. Hone and Tony F. Heinz},
  journal= {arXiv preprint arXiv:0705.3986},
  year   = {2011}
}

Variable Electron-Phonon Coupling in Isolated Metallic Carbon Nanotubes Observed by Raman Scattering

Abstract

Keywords

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