Journals of the American Physical Society - Quasiparticle spectral function in doped graphene: Electron-electron interaction effects in ARPES

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January 2008, to be published in Physical Review B15

Quasiparticle spectral function in doped graphene: Electron-electron interaction effects in ARPES
E. H. Hwang and S. Das Sarma

We calculate the electron self-energy as well as the quasiparticle spectral function in doped graphene taking into account electron-electron interaction in the leading order dynamically screened Coulomb coupling and electron-impurity interaction associated with quenched disorder. Our theory provides the basis for calculating {\it all} one-electron properties of extrinsic graphene. Comparison with existing ARPES measurements shows broad qualitative and semi-quantitative agreement between theory and experiment, both for the momentum-distribution and the energy-distribution curves in the measured spectra.

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