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Localized collective excitations in doped graphene in strong magnetic fields

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Fischer, Andrea M., Dzyubenko, Alexander B. and Roemer, Rudolf A.. (2009) Localized collective excitations in doped graphene in strong magnetic fields. Physical Review B (Condensed Matter and Materials Physics), Vol.80 (No.16). Article no. 165410. ISSN 1098-0121

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Official URL: http://dx.doi.org/10.1103/PhysRevB.80.165410

Abstract

We consider collective excitations in graphene with filled Landau levels (LL’s) in the presence of an external potential due to a single charged donor D+ or acceptor A− impurity. We show that localized collective modes split off the magnetoplasmon continuum and, in addition, quasibound states are formed within the continuum. A study of the evolution of the strengths and energies of magneto-optical transitions is performed for integer filling factors ν=1,2,3,4 of the lowest LL. We predict impurity absorption peaks above as well as below the cyclotron resonance. We find that the single-particle electron-hole symmetry of graphene leads to a duality between the spectra of collective modes for the D+ and A−. The duality shows up as a set of the D+ and A− magnetoabsorption peaks having the same energies but active in different circular polarizations.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Other > Institute of Advanced Study Faculty of Science > Physics Faculty of Science > Centre for Scientific Computing
Library of Congress Subject Headings (LCSH):	Collective excitations -- Research, Magnetic fields -- Research, Graphene -- Research, Wave equation, Absorption spectra, Exciton theory
Journal or Publication Title:	Physical Review B (Condensed Matter and Materials Physics)
Publisher:	American Physical Society
ISSN:	1098-0121
Date:	15 October 2009
Volume:	Vol.80
Number:	No.16
Page Range:	Article no. 165410
Identification Number:	10.1103/PhysRevB.80.165410
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access
Funder:	Engineering and Physical Sciences Research Council (EPSRC), University of Warwick
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URI:	http://wrap.warwick.ac.uk/id/eprint/2716