Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-12-26
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 3 figures
Scientific paper
We have calculated the plasmon modes in graphene double layer structures, taking into account the inhomogeneity of the system dielectric background. The effective dielectric function is obtained from the solution of the Poisson equation in three-layer dielectric medium with the graphene sheets located at the interfaces, separating different materials. Due to the momentum dispersion of the effective dielectric function, the intra- and inter-layer bare Coulomb interactions in graphene double layer systems acquire additional momentum dependence--an effect of the order of inter-layer interaction itself. It has been shown that the energies of in-phase and out-of-phase plasmon modes are determined by different dielectric permittivities. The obtained new features of the plasmon dispersions can be observed in frictional drag measurements and in inelastic light scattering and electron energy-loss spectroscopies.
Badalyan Samvel M.
Peeters François M.
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