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

Journal Article · Sat Oct 15 00:00:00 EDT 2011 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.84.165431· OSTI ID:21596909

Fischer, Andrea M ^[1]; Roemer, Rudolf A ^[2]; Dzyubenko, Alexander B ^[3]

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1. Institute of Advanced Study and Department of Physics, University of Warwick, Coventry CV4 7AL (United Kingdom)
2. Department of Physics and Centre for Scientific Computing, University of Warwick, Coventry CV4 7AL (United Kingdom)
3. Department of Physics, California State University Bakersfield, Bakersfield, California 93311 (United States)

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.

• OSTI ID: 21596909
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 84, Issue 16; Other Information: DOI: 10.1103/PhysRevB.84.165431; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION
CARBON
CLASSIFICATION
COLLECTIVE EXCITATIONS
ELECTRONS
HONEYCOMB STRUCTURES
IMPURITIES
LAYERS
MAGNETIC FIELDS
OPTICAL PROPERTIES
POLARIZATION
QUANTUM NUMBERS
SYMMETRY
ELEMENTARY PARTICLES
ELEMENTS
ENERGY-LEVEL TRANSITIONS
EXCITATION
FERMIONS
LEPTONS
MECHANICAL STRUCTURES
NONMETALS
PHYSICAL PROPERTIES
SORPTION