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Massless Dirac electrons in graphene fill Landau levels with energies scaledas square roots of their numbers. Coulomb interaction between electrons leadsto mixing of different Landau levels. The relative strength of this interactiondepends only on dielectric susceptibility of surrounding medium and can belarge in suspended graphene. We consider influence of Landau level mixing onthe properties of magnetoexcitons and magnetoplasmons - elementaryelectron-hole excitations in graphene in quantizing magnetic field. We showthat, at small enough background dielectric screening, the mixing leads to veryessential change of magnetoexciton and magnetoplasmon dispersion laws incomparison with the lowest Landau level approximation.

Influence of Landau level mixing on the properties of elementary excitations in graphene in strong magnetic field