We perform Raman scattering experiments on natural graphite in magnetic fields up to 45 T, observing a series of peaks due to interband electronic excitations over a much broader magnetic field range than previously reported. We also explore electron-phonon coupling in graphite via magnetophonon resonances. The Raman G peak shifts and splits as a function of magnetic field, due to the magnetically tuned coupling of the E2g optical phonons with the K- and H-point inter-Landau-level excitations. The analysis of the observed anticrossing behavior allows us to determine the electron-phonon coupling for both K- and H-point carriers. In the highest field range (>35 T) the G peak narrows due to suppression of electron-phonon interaction.
@article{arxiv.1112.3884,
title = {Magnetophonon resonance in graphite: High-field Raman measurements and electron-phonon coupling contributions},
author = {Y. Kim and Y. Ma and A. Imambekov and N. G. Kalugin and A. Lombardo and A. C. Ferrari and J. Kono and D. Smirnov},
journal= {arXiv preprint arXiv:1112.3884},
year = {2012}
}