Simple extension of the plane-wave final state in photoemission: Bringing understanding to the photon-energy dependence of two-dimensional materials

Abstract

The photoemission cross section of graphene is measured for two light polarizations and a wide range of photon energies at a flux-calibrated synchrotron light source. Modeling scattering effects by a simplistic model and sophisticated time-dependent density-functional-theory calculations, the complex phase shifts in the photoemission final state are extracted from the experiment to obtain complete information about the photoemission process.