Many-body interactions in quasi-freestanding graphene

Abstract

The Landau-Fermi liquid picture for quasiparticles assumes that charge carriers are dressed by many-body interactions, forming one of the fundamental theories of solids. Whether this picture still holds for a semimetal like graphene at the neutrality point, i.e., when the chemical potential coincides with the Dirac point energy, is one of the long-standing puzzles in this field. Here we present such a study in quasi-freestanding graphene by using high-resolution angle-resolved photoemission spectroscopy. We see the electron-electron and electron-phonon interactions go through substantial changes when the semimetallic regime is approached, including renormalizations due to strong electron-electron interactions with similarities to marginal Fermi liquid behavior. These findings set a new benchmark in our understanding of many-body physics in graphene and a variety of novel materials with Dirac fermions.

PNAS 2011 ; published ahead of print June 27, 2011

References in corpus (13)

• The electronic properties of graphene
• Dielectric function, screening, and plasmons in 2D graphene
• Charged Impurity Scattering in Graphene
• Scanning Tunneling Spectroscopy of Graphene on Graphite
• Atomic Hole Doping of Graphene
• The Role of Electron-electron Interactions in Graphene ARPES Spectra
• Ab initio GW many-body effects in graphene
• Metal to insulator transition in epitaxial graphene induced by molecular doping
• Velocity Renormalization and Carrier Lifetime in Graphene from Electron-Phonon Interaction
• Electron-phonon coupling and electron self-energy in electron-doped graphene: calculation of angular resolved photoemission spectra
• Spectro-microscopy of single and multi-layer graphene supported by a weakly interacting substrate
• Kohn anomaly and interplay of electron-electron and electron-phonon interactions in epitaxial graphene
• Unadulterated spectral function of low energy quasiparticles: Bi-2212, nodal direction