Curvature-induced optical phonon frequency shift in metallic carbon nanotubes

Ken Ichi Sasaki, Riichiro Saito, Gene Dresselhaus, Mildred S. Dresselhaus, Hootan Farhat, Jing Kong

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)

Abstract

The quantum corrections to the frequencies of the Γ point longitudinal-optical (LO)- and transverse-optical (TO)-phonon modes in carbon nanotubes are investigated theoretically. The frequency shift and broadening of the TO-phonon mode strongly depend on the curvature effect due to a special electron-phonon coupling in carbon nanotubes, which is shown by the Fermi energy dependence of the frequency shift for different nanotube chiralities. It is also shown that the TO mode near the Γ point decouples from electrons due to local gauge symmetry and that a phonon mixing between LO and TO modes is absent due to time-reversal symmetry. Some comparisons between theory and experiment are presented.

Original languageEnglish
Article number245441
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume77
Issue number24
DOIs
Publication statusPublished - 2008 Jun 27

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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