Multiphonon resonance Raman scattering in Landau-quantized graphene

摘要

We theoretically investigate multiphonon resonance Raman scattering between the Landau levels in graphene on the polar substrate using the Huang-Rhys's model. We not only present the single and multiple surface optical (SO) phonons scattering, but also propose the combined multiphonon scattering, which is composed of the SO phonon and longitudinal acoustic phonon. We find that the combined multiphonon scattering has a blue-shift behavior with increasing the magnetic field, differing from these SO phonon resonance scattering occurred at specific magnetic field values. This behavior may be used to explain the changing shoulder of the Raman spectrum of optical phonon resonance scattering in experiments. The theoretical model could be expanded to analyze the fine structure of Raman spectrum in two-dimensional materials. (C) 2018 Elsevier Ltd. All rights reserved.