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Symmetry content and spectral properties of charged collective excitations for graphene in strong magnetic fields

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Fischer, Andrea M., Roemer, Rudolf A. and Dzyubenko, Alexander B.. (2010) Symmetry content and spectral properties of charged collective excitations for graphene in strong magnetic fields. EPL (Europhysics Letters), Vol.92 (No.3). Article no. 37003. ISSN 0295-5075

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Official URL: http://dx.doi.org/10.1209/0295-5075/92/37003

Abstract

We show that graphene in a strong magnetic field with partially filled Landau levels sustains charged collective excitations—bound states of a neutral magnetoplasmon and free particles. In the limit of low density of excess charges, these are bound three-particle complexes. Some of these states are optically bright and may be detected in spectroscopy experiments, providing a direct probe of electron-electron interactions in graphene. The charged excitations can be classified using the geometrical symmetries—non-commutative magnetic translations and generalized rotations—in addition to the dynamical SU4 symmetry in graphene. From the SU4 symmetry point of view, such excitations are analogous to bound states of two quarks and one antiquark with four flavors. We establish a flavor optical selection rule to identify the bright states for experimental studies.

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):

Graphene, Magnetic fields, Spin excitations

Journal or Publication Title:

EPL (Europhysics Letters)

Publisher:

Institute of Physics Publishing Ltd.

ISSN:

0295-5075

Official Date:

2010

Dates:

Date	Event
2010	Published

Volume:

Vol.92

Number:

No.3

Page Range:

Article no. 37003

Identification Number:

10.1209/0295-5075/92/37003

Status:

Peer Reviewed

Publication Status:

Published

Access rights to Published version:

Restricted or Subscription Access

Funder:

Engineering and Physical Sciences Research Council (EPSRC), Research Corporation, Kavli Institute for Theoretical Physics (KITP), University of California, Santa Barbara (UCSB)

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