Coulomb interaction effects in graphene bilayers probed by ARPES

Details Coulomb interaction effects in graphene bilayers probed by ARPES Coulomb interaction effects in graphene bilayers probed by ARPES

2012-02-04

arxiv.org/abs/1202.0900v1

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 5 figures

Scientific paper

We report a theoretical study of the many-body effects of electron-electron interaction on the ground-state and spectral properties of bilayer graphene. Using a projector-based renormalization method we show that if a finite voltage difference is applied between the graphene layers electron-hole pairs can be formed and---at very low temperatures---an excitonic instability might emerge in a bilayer graphene structure. The single-particle spectral function near the Fermi surface exhibits a prominent quasi-particle peak, different from neutral (undoped) bilayer graphene. Away from the Fermi surface, we find that states strongly interact with plasmons, thereby giving rise to a broad plasmaron peak that explains prominent features of recent angle-resolved photoemission spectroscopy data.

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