Visualization of nano-plasmons in graphene
arXiv:1108.4046 · doi:10.1080/14786435.2011.611827
Abstract
We study localized plasmons at the nanoscale (nano-plasmons) in graphene. The collective excitations of induced charge density modulations in graphene are drastically changed in the vicinity of a single impurity compared to graphene's bulk behavior. The dispersion of nano-plasmons depends on the number of electrons and the sign, strength and size of the impurity potential. Due to this rich parameter space the calculated dispersions are intrinsically multidimensional requiring an advanced visualization tool for their efficient analysis, which can be achieved with parallel rendering. To overcome the problem of analyzing thousands of very complex spatial patterns of nano-plasmonic modes, we take a combined visual and quantitative approach to investigate the excitations on the two-dimensional graphene lattice. Our visual and quantitative analysis shows that impurities trigger the formation of localized plasmonic excitations of various symmetries. We visually identify dipolar, quadrupolar and radial modes, and quantify the spatial distributions of induced charges.
14 pages, 9 figures
References in corpus (10)
- Electron scattering on microscopic corrugations in graphene
- Electron states of mono- and bilayer graphene on SiC probed by STM
- The Coulomb impurity problem in graphene
- Scanning tunneling spectroscopy of inhomogeneous electronic structure in monolayer and bilayer graphene on SiC
- Spatially resolved spectroscopy of monolayer graphene on SiO2
- Effect of a single impurity on the local density of states in monolayer and bilayer graphene
- Dielectric function and plasmons in graphene
- Nonmagnetic-Defect-Induced Magnetism in Graphene
- Electromagnetic response of broken-symmetry nano-scale clusters
- Impurity assisted nanoscale localization of plasmonic excitations in graphene