Plasmonic Excitations in Carbon Nanostructures: Carbon Nanotubes Vs. Graphene

Le résumé fourni par la source

The interactions of charged particles with carbon nanotubes (CNTs) and graphene layers may excite plasmonic modes in the two-dimensional electron gas that constitute these shells. It has recently been proposed that plasmonic excitations could serve as an innovative approach to short-wavelength, high-gradient particle acceleration. It may transform current particle acceleration techniques and lead to new developments in high-energy physics and related disciplines. In this chapter, we compare the excited wakefields created by a charged particle traveling along a CNT and between two graphene layers. We use a theory based on a linearized hydrodynamic model in conjunction with the Poisson’s equation to describe the electronic excitations produced by a fast point-like charge. In this model, surface plasmonic excitations are described by treating the electron gas as a two-dimensional plasma with additional terms in the fluid momentum equation arising from specific solid-state properties of the gas. Analytical expressions of the excited wakefields are derived that, in the case of a single-walled CNT, may be related to the resonant frequencies obtained from the dispersion relation. The dependence of the wakefields on model parameters, such as particle velocity, tube aperture, distance between graphene layers, friction parameter, and surface density, is analyzed.

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