First-principles study of electron linewidths in graphene.
We present first-principles calculations of the linewidths of low-energy quasiparticles in n-doped graphene arising from both the electron-electron and the electron-phonon interactions. The contribution to the electron linewidth arising from the electron-electron interactions varies significantly with wave vector at fixed energy; in contrast, the electron-phonon contribution is virtually wave vector independent. These two contributions are comparable in magnitude at a binding energy of approximately 0.2 eV, corresponding to the optical phonon energy. The calculated linewidths, with both electron-electron and electron-phonon interactions included, explain to a large extent the linewidths seen in recent photoemission experiments.
Park
Cheol-Hwan
CH
Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA.
Giustino
Feliciano
F
Spataru
Catalin D
CD
Cohen
Marvin L
ML
Louie
Steven G
SG