Resonance Raman scattering in graphene: Probing phonons and electrons

In this work, by using different laser excitation energies, we obtain important electronic and vibrational properties of mono- and bi-layergraphene. For monolayergraphene, we determine the phonon dispersion near the Dirac point for the in-plane transverse optical (iTO) mode. This result is compared with recent calculations that take into account electron-electron correlations for the phonon dispersion around the K point. For bilayer graphene we extract the Slonczewski-Weiss-McClure band parameters and compare them with recent infrared measurements. We also analyze the second-order feature in the Raman spectrum for trilayer graphene. (C) 2009 Elsevier Ltd. All rights reserved.