Coulomb interaction effects in graphene bilayers: electron-hole pairing and plasmaron formation
arXiv:1202.0900 · doi:10.1088/1367-2630/14/7/075007
Abstract
We report a theoretical study of the many-body effects of electron-electron interaction on the ground-state and spectral properties of double-layer 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 double-layer graphene structure. The single-particle spectral function near the Fermi surface exhibits a prominent quasiparticle peak, different from neutral (undoped) graphene bilayers. Away from the Fermi surface, we find that the charge carriers strongly interact with plasmons, thereby giving rise to a broad plasmaron peak in the angle-resolved photoemission spectrum.
11 pages, 5 figures, final (substantially revised) version
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Cited by in corpus (12)
- Fate of the excitonic insulator in the presence of phonons
- Exact-diagonalization study of exciton condensation in electron bilayers
- Fermi-liquid ground state of interacting Dirac fermions in two dimensions
- Coherent exciton transport in semiconductors
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