Magnetoplasmons bound to short-range impurities in graphene: Symmetries and optics

We consider a graphene sheet in the presence of a strong perpendicular magnetic field with a single short-range {delta} impurity situated at one of the carbon sites. We study the neutral inter-Landau level collective excitations, magnetoplasmons, which become localized on the impurity. Some of these...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2011-10, Vol.84 (16), Article 165431
Main Authors: Fischer, Andrea M., Römer, Rudolf A., Dzyubenko, Alexander B.
Format: Article
Language:English
Subjects:
ABSORPTION
CARBON
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CLASSIFICATION
COLLECTIVE EXCITATIONS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY-LEVEL TRANSITIONS
EXCITATION
FERMIONS
HONEYCOMB STRUCTURES
IMPURITIES
LAYERS
LEPTONS
MAGNETIC FIELDS
MECHANICAL STRUCTURES
NONMETALS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
POLARIZATION
QUANTUM NUMBERS
SORPTION
SYMMETRY
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Summary:We consider a graphene sheet in the presence of a strong perpendicular magnetic field with a single short-range {delta} impurity situated at one of the carbon sites. We study the neutral inter-Landau level collective excitations, magnetoplasmons, which become localized on the impurity. Some of these excitations involve a pseudospin flip (intervalley transitions), since the impurity can scatter electrons between the two valleys. We propose a classification of states of the excitations in graphene and introduce the appropriate quantum numbers. The energies and optical strengths of collective excitations are calculated for a range of integer filling factors and impurity strengths. We establish a set of symmetries matching the energies and absorption strengths of collective excitations for different sublattice locations of the impurity, filling factors, circular light polarizations, and signs of the impurity potential.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.84.165431