Coulomb interaction effects in graphene bilayers: electron-hole pairing and plasmaron formation
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.
Keywords
Cite
@article{arxiv.1202.0900,
title = {Coulomb interaction effects in graphene bilayers: electron-hole pairing and plasmaron formation},
author = {Van-Nham Phan and Holger Fehske},
journal= {arXiv preprint arXiv:1202.0900},
year = {2015}
}
Comments
11 pages, 5 figures, final (substantially revised) version