Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-11-04
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Ref. [26] was added and Ref. [18] was updated
Scientific paper
Massless Dirac electrons in graphene fill Landau levels with energies scaled as square roots of their numbers. Coulomb interaction between electrons leads to mixing of different Landau levels. The relative strength of this interaction depends only on dielectric susceptibility of surrounding medium and can be large in suspended graphene. We consider influence of Landau level mixing on the properties of magnetoexcitons and magnetoplasmons - elementary electron-hole excitations in graphene in quantizing magnetic field. We show that, at small enough background dielectric screening, the mixing leads to very essential change of magnetoexciton and magnetoplasmon dispersion laws in comparison with the lowest Landau level approximation.
Lozovik Yu. E.
Sokolik A. A.
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