Open Access Nano Express

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

Yurii E Lozovik12* and Alexey A Sokolik1

Author Affiliations

1 Institute for Spectroscopy, Russian Academy of Sciences, Fizicheskaya 5, 142190, Troitsk, Moscow Region, Russia

2 Moscow Institute of Physics and Technology, Institutskii Per. 9, 141700, Dolgoprudny, Moscow Region, Russia

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Nanoscale Research Letters 2012, 7:134  doi:10.1186/1556-276X-7-134

Published: 16 February 2012

Abstract

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.

PACS: 73.22.Pr; 71.35.Ji; 73.43.Mp; 71.70.Gm.