Correlations, Plasmarons, and Quantum Spectral Function in Bilayer Graphene

Details Correlations, Plasmarons, and Quantum Spectral Function in Bilayer Graphene Correlations, Plasmarons, and Quantum Spectral Function in Bilayer Graphene

2011-02-07

arxiv.org/abs/1102.1427v1

Physical Review B, 84, 041408(R), 2011

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures

Scientific paper

We theoretically study the many-body effects of electron electron interaction on the single particle spectral function of doped bilayer graphene. Using random phase approximation, we calculate the real and imaginary part of the self-energy and hence the spectral function. The spectral function near the Fermi surface shows the usual quasiparticle peak, establishing doped bilayer graphene, in contrast to the unstable neutral system, to be a Fermi liquid. Away from the Fermi surface, an additional broad plasmaron peak is visible in the spectral function. From the low energy behaviour of the self-energy we calculate the quasiparticle residue and the effective mass of the quasiparticles as a function of carrier density. We present results for both the on-shell and the off-shell approximation for the quasiparticle renormalization.

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