Plasmon activated forbidden phonon modes in defect-free graphene by tip-enhanced nano-confined light

摘要

We report the activation and the first observation of the defect-activated combination Raman bands: D+D',D+G or both, and also observe the D and D， defect induced peaks that have been previously reported. The activation of the forbidden modes is due to the breakdown of the Raman selection rules caused by the high photon confinement and the FGE induced by the tip-enhanced nano-confined light source used in our STM-TERS experiments.