Magnetophonon resonance in graphite: High-field Raman measurements and electron-phonon coupling contributions

Details Magnetophonon resonance in graphite: High-field Raman measurements and electron-phonon coupling contributions Magnetophonon resonance in graphite: High-field Raman measurements and electron-phonon coupling contributions

2011-12-16

arxiv.org/abs/1112.3884v2

Physical Review B, 85 121403(R) (2012)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures, 1 table

Scientific paper

10.1103/PhysRevB.85.121403

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.

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