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

Abstract

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.

The Temperature Dependence of Optical Phonon Scattering in Graphene under Strong Magnetic Field

“…The magnetophonon resonance of monolayer and mutilayer graphene also has been observed from the magneto-Raman scattering and magneto-optical conductivity experiments in recent years. [10][11][12][13] These experiments identified and confirmed the earlier theoretical results. The other interesting phenomenon related to the optical phonon scattering, for instance, the Raman scattering accompanied by the emission of a pair of LO or longitudinal acoustic (LA) phonon from the corner of the BZ has been observed.…”

Infrared magnetospectroscopy of graphite in tilted fields

“…Limits of this model have been found, e.g., by revealing the electron-hole asymmetry at the K point of bulk graphite in recent magnetotransmission, 11 magnetoreflection, 14,17 and magneto-Raman studies. 15,16 The full SWM model has to be used in such a case to get a quantitative agreement between experimental data and theory.…”

Decoherence in semiconductor nanostructures with type-II band alignment: All-optical measurements using Aharonov-Bohm excitons

“…[35]. Light from a ThorLabs temperature-controlled 405 nm laser diode was injected into a 365 µm fiber and delivered to the sample in a 3 He cryostat.…”