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arXiv · 1612.06663

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

A. A. Sokolik·A. D. Zabolotskiy·Yu. E. Lozovik
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Abstract

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. Important role of a self-consistent treatment of the screening is found.

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A. A. Sokolik, A. D. Zabolotskiy, Yu. E. Lozovik. 2017-02-07. Many-body effects of Coulomb interaction on Landau levels in graphene. https://doi.org/10.1103/physrevb.95.125402

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