Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-07-07
Phys. Rev. B 84, 165431-11 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
12 pages, 8 figures
Scientific paper
10.1103/PhysRevB.84.165431
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.
Dzyubenko Alexander B.
Fischer Andrea M.
R{ö}mer Rudolf A.
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