Quantum Interferences in the Raman Cross Section for the Radial Breathing Mode in Metalic Carbon Nanotubes

Details Quantum Interferences in the Raman Cross Section for the Radial Breathing Mode in Metalic Carbon Nanotubes Quantum Interferences in the Raman Cross Section for the Radial Breathing Mode in Metalic Carbon Nanotubes

2004-08-26

arxiv.org/abs/cond-mat/0408583v1

Physics

Condensed Matter

Materials Science

10 pages, 3 figures

Scientific paper

10.1103/PhysRevB.71.041404

The lineshapes of the Raman excitation profiles for radial breathing modes in carbon nanotubes are shown to be strongly affected by interference effects that arise whenever strong optical transitions are separated by a small energy. This is the case in metallic zigzag and chiral tubes, where one-dimensional singularities in the electronic joint density of states are split due to the trigonal warping of the electronic band structure of two-dimensional graphene. It is shown that the proper modeling of these interferences is crucial for the identification of the (n,m) indices using Raman spectroscopy.

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