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.

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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
Date:	2011
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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