Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-02-24
Phys. Rev. B 165410-5 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 5 figures (only 3 captions). Included a more qualitative discussion of the results and method, in particular addressi
Scientific paper
10.1103/PhysRevB.80.165410
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 nu = 1, 2, 3, 4 of the lowest LL. We predict impurity absorption peaks above as well as below the cyclotron resonance. We show 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- magneto-absorption peaks having same energies, but active in different circular polarizations.
Dzyubenko Alexander B.
Fischer Andrea M.
Roemer Rudolf A.
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