Kohn Anomaly in Raman Spectroscopy of Single Wall Carbon Nanotubes

Details Kohn Anomaly in Raman Spectroscopy of Single Wall Carbon Nanotubes Kohn Anomaly in Raman Spectroscopy of Single Wall Carbon Nanotubes

2010-04-30

arxiv.org/abs/1004.5473v1

Physica E, 42, 2005-2015 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

36 pages, 9 figures

Scientific paper

10.1016/j.physe.2010.03.007

Phonon softening phenomena of the $\Gamma$ 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 electron-phonon interaction.

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