The linewidths of the $\pi$ and $\sigma$ bands originating from the electron-phonon coupling in graphene are analyzed based on model calculations and experimental angle-resolved photoemission spectroscopy (ARPES) data. We find evidence for crucial contributions to the lifetime broadening from interband scattering $\pi \to \sigma$ and $\sigma \to \pi$, respectively, driven by the out-of-plane ZA acoustic phonons. The essential features of the calculated $\sigma$ band linewidths are in agreement with recent published ARPES data [Mazzola et al., Phys. Rev. B 95, 075430 (2017)] and of the $\pi$ band linewidth with ARPES data presented here.

• Received 27 August 2018

DOI:https://doi.org/10.1103/PhysRevB.98.205428