Strainology of Raman phonons in bended, periodically buckled, and rippled graphene

Abstract

We perform a thorough study of the strainology of the Raman response in graphene, for different external perturbations, within the framework of a long-wavelength, effective field theory for the vibrational spectrum. We calculate the evolution of the G-peak for the cases of compressive and stretching strains, and we discuss our results in connection to the physics of the G-peak redshift due to bending/uniaxial strain and the G-peak blueshift due to a substrate. Furthermore, we calculate the Raman response for the cases of periodic buckling of nanoribbons and within a toy model for ripples, and in both cases we are able to obtain a rather broad, D-like-peak in the Raman spectrum, even for the case of defect free graphene. We discuss all our theoretical results in connection to recent Raman spectroscopy experiments.