Electron-Electron Interactions and Plasmon Dispersion in Graphene

Abstract

Plasmons in two-dimensional electron systems with nonparabolic bands, such as graphene, feature strong dependence on electron-electron interactions. We use a many-body approach to relate plasmon dispersion at long wavelengths to Landau Fermi-liquid interactions and quasiparticle velocity. An identical renormalization is shown to arise for the magnetoplasmon resonance. For a model with N>>1 fermion species, this approach predicts a power-law dependence for plasmon frequency vs. carrier concentration, valid in a wide range of doping densities, both high and low. Gate tunability of plasmons in graphene can be exploited to directly probe the effects of electron-electron interaction.

9 pgs, 2 fgs

References in corpus (7)

• Optical nano-imaging of gate-tuneable graphene plasmons
• Dielectric function, screening, and plasmons in 2D graphene
• Dynamical polarization of graphene at finite doping
• Quantum critical point in graphene approached in the limit of infinitely strong Coulomb interaction
• Collective modes of the massless Dirac plasma
• Drude weight, plasmon dispersion, and a.c. conductivity in doped graphene sheets
• Anomalous thermodynamics of Coulomb interacting massless Dirac fermions in two spatial dimensions

Cited by in corpus (25)

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• Plasmon losses due to electron-phonon scattering: the case of graphene encapsulated in hexagonal Boron Nitride
• Violation of the Wiedemann-Franz law in clean graphene layers
• Hydrodynamic approach to two-dimensional electron systems
• Hydrodynamic-to-ballistic crossover in Dirac fluid
• Interacting Electrons in Graphene: Fermi Velocity Renormalization and Optical Response
• Intrinsically Undamped Plasmon Modes in Narrow Electron Bands
• Plasmons in strongly correlated systems: spectral weight transfer and renormalized dispersion
• Plasmonics in topological insulators: Spin-charge separation, the influence of the inversion layer, and phonon-plasmon coupling
• Transport coefficients of graphene: Interplay of impurity scattering, Coulomb interaction, and optical phonons
• Cyclotron resonance overtones and near-field magnetoabsorption via terahertz Bernstein modes in graphene
• Emission of plasmons by drifting Dirac electrons: where hydrodynamics matters
• Hydrodynamic collective modes in graphene
• How many-body effects modify the van der Waals interaction between graphene sheets
• On-chip transfer of ultrashort graphene plasmon wavepackets using terahertz electronics
• Non-local hydrodynamic transport and collective excitations in Dirac fluids
• Acoustic plasmons at the crossover between the collisionless and hydrodynamic regimes in two-dimensional electron liquids
• Optical signatures of shear collective modes in strongly interacting Fermi liquids
• Electrical plasmon detection in graphene waveguides
• Comment on "Negative Landau damping in bilayer graphene"
• The intrinsic charge and spin conductivities of doped graphene in the Fermi-Liquid regime
• Transport signatures of plasmon fluctuations in electron hydrodynamics
• Selective damping of plasmons in coupled two-dimensional systems by Coulomb drag
• Triplet excitations in graphene-based systems