Chirality-dependent G-band Raman intensity of carbon nanotubes - art. no. 085312

The chirality-dependent G-band Raman intensity of single wall carbon nanotu bes is calculated using a nonresonant theory for the Raman tensor. We obtai n six or three intense Raman modes, respectively, for chiral or achiral nan otubes, whose relative intensities depend on the chiral angle of the nanotu be. The longitudinal and transverse optical phonon modes in two-dimensional graphite become, respectively, transverse and longitudinal optical phonon modes in a one-dimensional nanotube. Confocal micro-Raman measurements of i ndividual single wall carbon nanotubes show chirality-dependent spectra of the G-band intensity, as predicted by this theory.