Effect of electron-electron interaction on the Fermi surface topology of doped graphene

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dc.creatorRoldan, R.
dc.creatorLopez-Sancho, M. P.
dc.creatorGuinea, F.
dc.date2007-10-16
dc.date2008-03-14
dc.date.accessioned2026-07-07T09:26:30Z
dc.date.available2026-07-07T09:26:30Z
dc.descriptionThe electron-electron interactions effects on the shape of the Fermi surface of doped graphene are investigated. The actual discrete nature of the lattice is fully taken into account. A $π$-band tight-binding model, with nearest-neighbor hopping integrals, is considered. We calculate the self-energy corrections at zero temperature. Long and short range Coulomb interactions are included. The exchange self-energy corrections for graphene preserve the trigonal warping of the Fermi surface topology, although rounding the triangular shape. The band velocity is renormalized to higher value. Corrections induced by a local Coulomb interaction, calculated by second order perturbation theory, do deform anisotropically the Fermi surface shape. Results are compared to experimental observations and to other theoretical results.
dc.description10 pages, 6 figures
dc.identifierhttps://arxiv.org/abs/0710.3034
dc.identifierhttp://arxiv.org/abs/0710.3034
dc.identifierPhys. Rev. B 77, 115410 (2008)
dc.identifierdoi:10.1103/PhysRevB.77.115410
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/156771
dc.subjectStrongly Correlated Electrons
dc.subjectMesoscale and Nanoscale Physics
dc.titleEffect of electron-electron interaction on the Fermi surface topology of doped graphene
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