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The lineshapes of the Raman excitation profiles for radial breathing modes incarbon nanotubes are shown to be strongly affected by interference effects thatarise whenever strong optical transitions are separated by a small energy. Thisis the case in metallic zigzag and chiral tubes, where one-dimensionalsingularities in the electronic joint density of states are split due to thetrigonal warping of the electronic band structure of two-dimensional graphene.It is shown that the proper modeling of these interferences is crucial for theidentification of the (n,m) indices using Raman spectroscopy.Comment: 10 pages, 3 figure

Quantum interferences in the Raman cross section for the radial breathing mode in metallic carbon nanotubes