Localised magneto‐optical collective excitations of impure graphene |
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Authors: | AM Fischer AB Dzyubenko RA Rmer |
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Institution: | 1. Phone: +44 (24) 765 74752, Fax: +44 (24) 765 73133;2. Department of Physics, California State University Bakersfield, Bakersfield, CA 93311, USA;3. General Physics Institute, Russian Academy of Sciences, Moscow 119991, Russia;4. Department of Physics and Centre for Scientific Computing, University of Warwick, Coventry CV4 7AL, UK |
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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 δ‐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. |
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Keywords: | Graphene magnetoplasmons collective excitations |
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