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Regular version of the site

Article

Many-body effects of Coulomb interaction on Landau levels in graphene

Physical Review B: Condensed Matter and Materials Physics. 2017. Vol. 95. No. 12-5402. P. 125402-1-125402-7.
A. A. Sokolik, Zabolotskiy A. D., Yu. E. Lozovik.

In strong magnetic fields, massless electrons in graphene populate relativistic Landau levels with the square-root dependence of each level energy on its number and magnetic field. Interaction-induced deviations from this single-particle picture were observed in recent experiments on cyclotron resonance and magneto-Raman scattering. Previous attempts to calculate such deviations theoretically using the unscreened Coulomb interaction resulted in overestimated many-body effects. This work presents many-body calculations of cyclotron and magneto-Raman transitions in single-layer graphene in the presence of Coulomb interaction, which is statically screened in the random-phase approximation. We take into account self-energy and excitonic effects as well as Landau level mixing, and achieve good agreement of our results with the experimental data for graphene on different substrates. The important role of a self-consistent treatment of the screening is found.