Localised Magneto-Optical Collective Excitations of Impure Graphene
arXiv:0910.0019 · doi:10.1002/andp.200910381
Abstract
We study optically-induced collective excitations of graphene in the presence of a strong perpendicular magnetic field and a single impurity. We determine the energies and absorption strengths of these excitations, which become localised on the impurity. Two different types of impurity are considered i. the long-range Coulomb impurity, ii. a delta-function impurity located at either an A or B graphene sublattice site. Both impurity types result in some bound states appearing both above and below the magnetoplasmon continuum, although the effect of the short-range impurity is less pronounced. The dependence of the energies and oscillator strengths of the bound states on the filling factor is investigated.
4 pages, 4 figures, accepted for publication in Ann. Phys. (Leipzig)