Dielectric screening and plasmons in AA-stacked bilayer graphene

Abstract

The screening properties and collective excitations (plasmons) in AA-stacked bilayer graphene are studied within the random phase approximation (RPA). Whereas long lived plasmons in single layer graphene and in AB-stacked bilayer graphene can exist only in doped samples, we find that coherent plasmons can disperse in AA-stacked bilayer graphene {\it even in the absence of doping}. Moreover, we show that the characteristic low energy dispersion relation is unaffected by changes in the number of carriers, unless the chemical potential of the doped sample exceeds the inter-layer hopping energy. We further consider the effect of an external electric field applied perpendicular to the layers, and show how the dispersion of the modes can be tuned by the application of a gate voltage.

7 pages; 4 figures. Published version

References in corpus (16)

• The electronic properties of graphene
• Graphene plasmonics
• Dielectric function, screening, and plasmons in 2D graphene
• The electronic properties of bilayer graphene
• Dynamical polarization of graphene at finite doping
• Dynamical polarization, screening, and plasmons in gapped graphene
• Optical conductivity of bilayer graphene with and without an asymmetry gap
• Drude weight, plasmon dispersion, and a.c. conductivity in doped graphene sheets
• Dynamical conductivity of AA-stacked bilayer graphene
• Dynamic Screening and Low Energy Collective Modes in Bilayer Graphene
• Excitation spectrum and high energy plasmons in single- and multi-layer graphene
• Band topology and quantum spin Hall effect in bilayer graphene
• Plasmons in layered structures including graphene
• Gapped phase in AA stacked bilayer graphene
• Electrically tunable plasma excitations in AA-stacking multilayer graphene
• Collisionless Hydrodynamics of Doped Graphene in a Magnetic Field

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• Dynamical spin-spin susceptibility of Silicene
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• Optical Properties of Graphene in Magnetic and Electric fields
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