Kohn anomaly in Raman spectroscopy of single wall carbon nanotubes

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

Research output: Contribution to journalReview article

26 Citations (Scopus)

Abstract

Phonon softening phenomena of the Γ point optical modes including the longitudinal optical mode, transverse optical mode and radial breathing mode in "metallic" single wall carbon nanotubes are reviewed from a theoretical point of view. The effect of the curvature-induced mini-energy gap on the phonon softening which depends on the Fermi energy and chirality of the nanotube is the main subject of this article. We adopt an effective-mass model with a deformation-induced gauge field which provides us with a unified way to discuss the curvature effect and the electronphonon interaction.

Original languageEnglish
Pages (from-to)2005-2015
Number of pages11
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume42
Issue number8
DOIs
Publication statusPublished - 2010 Jun 1

Keywords

  • Carbon nanotube
  • Curvature effect
  • Energy gap
  • Fermi energy
  • Graphene
  • Phonon self-energy
  • Raman G band

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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