First-Principles Study of Electron Linewidths in Graphene

作者：Park Cheol Hwan^*; Giustino Feliciano; Spataru Catalin D; Cohen Marvin L; Louie Steven G

来源：Physical Review Letters, 2009, 102(7): 076803.

DOI：10.1103/PhysRevLett.102.076803

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 similar to 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.

• 出版日期2009-2-20