▎ 摘　　要

Recently, Russell et al. [Phys. Rev. Lett. 120, 047401 (2018)] have reported a clear signal of many-particle contributions to cyclotron resonance in high-mobility hexagonal boron nitride (hBN)-encapsulated graphene, observing significant variations of resonance energies as a function of the filling factor. for a series of interband channels. To elucidate their results, Coulombic contributions to the Landau-level spectra and cyclotron resonance in graphene are examined with a possible band gap taken into account and with emphasis on revealing electron-hole (e-h) conjugation symmetry underlying such level and resonance spectra. Theory, based on the single-mode approximation, gives a practically good account of the experimental data; the data suggest a band gap of similar to 10 meV and show a profile that apparently reflects e-h conjugation symmetry.