Fischer, Andrea M., Roemer, Rudolf A. and Dzyubenko, Alexander. (2011) Magnetoplasmons bound to short-range impurities in graphene: Symmetries and optics. Physical Review B (Condensed Matter and Materials Physics), Vol.84 (No.16). Arrticle No.165431. ISSN 1098-0121

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Abstract

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.

Item Type:	Journal Article
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Physical Review B (Condensed Matter and Materials Physics)
Publisher:	American Physical Society
ISSN:	1098-0121
Official Date:	2011
Dates:	Date Event 2011 Published
Volume:	Vol.84
Number:	No.16
Page Range:	Arrticle No.165431
Identification Number:	10.1103/PhysRevB.84.165431
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Cottrell Research Corporation (CSUB)
URI:	http://wrap.warwick.ac.uk/id/eprint/39659

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