Many-body filling-factor dependent renormalization of Fermi velocity in graphene in strong magnetic field

Abstract

We present the theory of many-body corrections to cyclotron transition energies in graphene in strong magnetic field due to Coulomb interaction, considered in terms of the renormalized Fermi velocity. A particular emphasis is made on the recent experiments where detailed dependencies of this velocity on the Landau level filling factor for individual transitions were measured. Taking into account the many-body exchange, excitonic corrections and interaction screening in the static random-phase approximation, we successfully explained the main features of the experimental data, in particular that the Fermi velocities have plateaus when the 0th Landau level is partially filled and rapidly decrease at higher carrier densities due to enhancement of the screening. We also explained the features of the nonmonotonous filling-factor dependence of the Fermi velocity observed in the earlier cyclotron resonance experiment with disordered graphene by taking into account the disorder-induced Landau level broadening.

arXiv comment14 pages, 8 figures; additional calculation data (in particular, Fig. 4) were included in this new version

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Cited by in corpus (4)

• Broken symmetries and Kohn's theorem in graphene cyclotron resonance
• Many-body effects, orbital mixing and cyclotron resonance in bilayer graphene
• Infrared spectroscopy of phase transitions in the lowest Landau levels of bilayer graphene
• Many-body effects in suspended graphene probed through magneto-phonon resonances