Localised magneto-optical collective excitations of impure graphene
| Autor: | Alexander B. Dzyubenko, Rudolf A. Römer, Andrea M. Fischer |
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| Rok vydání: | 2009 |
| Předmět: |
Physics
Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Filling factor Graphene FOS: Physical sciences General Physics and Astronomy Condensed Matter::Mesoscopic Systems and Quantum Hall Effect law.invention Magneto optical Impurity law Condensed Matter::Superconductivity Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Bound state Quasiparticle Coulomb Condensed Matter::Strongly Correlated Electrons Perpendicular magnetic field |
| Zdroj: | Annalen der Physik. 18:944-948 |
| ISSN: | 1521-3889 0003-3804 |
| Popis: | 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. Comment: 4 pages, 4 figures, accepted for publication in Ann. Phys. (Leipzig) |
| Databáze: | OpenAIRE |
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