We report on a theoretical study of the influence of electron-electron interactions on ARPES spectra in graphene that is based on the random-phase-approximation and on graphene's massless Dirac equation continuum model. We find that level repulsion between quasiparticle and plasmaron resonances gives rise to a gap-like feature at small k. ARPES spectra are sensitive to the electron-electron interaction coupling strength αgr and might enable an experimental determination of this material parameter.
@article{arxiv.0707.4230,
title = {The Role of Electron-electron Interactions in Graphene ARPES Spectra},
author = {Marco Polini and Reza Asgari and Giovanni Borghi and Yafis Barlas and T. Pereg-Barnea and A. H. MacDonald},
journal= {arXiv preprint arXiv:0707.4230},
year = {2008}
}