Dielectric function and plasmons in graphene

Abstract

The electromagnetic response of graphene, expressed by the dielectric function, and the spectrum of collective excitations are studied as a function of wave vector and frequency. Our calculation is based on the full band structure, calculated within the tight-binding approximation. As a result, we find plasmons whose dispersion is similar to that obtained in the single-valley approximation by Dirac fermions. In contrast to the latter, however, we find a stronger damping of the plasmon modes due to inter-band absorption. Our calculation also reveals effects due to deviations from the linear Dirac spectrum as we increase the Fermi energy, indicating an anisotropic behavior with respect to the wave vector of the external electromagnetic field.

References in corpus (6)

• Electric Field Effect in Atomically Thin Carbon Films
• The electronic properties of graphene
• Dielectric function, screening, and plasmons in 2D graphene
• Dynamical polarization of graphene at finite doping
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Cited by in corpus (7)

• Dirac electronic states in graphene systems: Optical spectroscopy studies
• Excitation spectrum and high energy plasmons in single- and multi-layer graphene
• Graphene-based polaritonic crystal
• Nonequilibrium plasmons with gain in graphene
• Dynamical polarization of graphene under strain
• Dynamical current-current correlation of the hexagonal lattice and graphene
• Quantum Junction Plasmons in Graphene Dimers