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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. doi:10.1103/PhysRevB.80.165410 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 | ||||
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Subjects: | Q Science > QC Physics | ||||
Divisions: | Other > Institute of Advanced Study Faculty of Science, Engineering and Medicine > Science > Physics Faculty of Science, Engineering and Medicine > Science > Centre for Scientific Computing |
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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 | ||||
Official Date: | 15 October 2009 | ||||
Dates: |
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Volume: | Vol.80 | ||||
Number: | No.16 | ||||
Page Range: | Article no. 165410 | ||||
DOI: | 10.1103/PhysRevB.80.165410 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Open Access (Creative Commons) | ||||
Funder: | Engineering and Physical Sciences Research Council (EPSRC), University of Warwick |
Data sourced from Thomson Reuters' Web of Knowledge
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