Calculation of the Raman spectra of graphene nanoribbon

Using the density functional theory in a local density approximation, Raman spectra of carbon nanoribbons are calcu- lated. It is found that for all the nanoribbons considered by us, there are three active modes: these are the radial breathing mode RBLM in a frequency range of 346-474 cm−1, the localized mode in the frequency range of 1449-1462 cm−1 and the graphene-like mode at the frequency of about 1650 cm−1. These active modes can be useful for identification of the various nanoribbons in Raman scattering experiments.