Phonon Linewidths and Electron Phonon Coupling in Nanotubes

Details Phonon Linewidths and Electron Phonon Coupling in Nanotubes Phonon Linewidths and Electron Phonon Coupling in Nanotubes

2005-08-29

arxiv.org/abs/cond-mat/0508700v2

Phys. Rev. B 73, 155426 (2006)

Physics

Condensed Matter

Materials Science

5 pages, 4 figures (correction in label of fig 3)

Scientific paper

10.1103/PhysRevB.73.155426

We prove that Electron-phonon coupling (EPC) is the major source of broadening for the Raman G and G- peaks in graphite and metallic nanotubes. This allows us to directly measure the optical-phonon EPCs from the G and G- linewidths. The experimental EPCs compare extremely well with those from density functional theory. We show that the EPC explains the difference in the Raman spectra of metallic and semiconducting nanotubes and their dependence on tube diameter. We dismiss the common assignment of the G- peak in metallic nanotubes to a Fano resonance between phonons and plasmons. We assign the G+ and G- peaks to TO (tangential) and LO (axial) modes.

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