Figure 3: Resonance process for the G band. On the left, the graphene phonon dispersion is shown, with a red-filled circle indicating the G band frequency and momentum. On the top right, the G band eigenvector is shown by the red arrows. On the bottom right, a zoom near the K point electronic dispersion shows the cone structure for the bands near the Fermi level (the Dirac cone). The wavy arrows indicate the incoming (green) and outgoing (red) photons. The electronic transitions induced by the incoming photon (green), the G band phonon (black), and the outgoing photon (red) are indicated by the vertical arrows.