Journal
2D MATERIALS
Volume 3, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2053-1583/3/1/015004
Keywords
magnetophonon resonance; electron-phonon coupling; magneto-Raman spectroscopy
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Funding
- European Research Council (MOMB project) [320590]
- EC Graphene Flagship project [604391]
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Our low-temperature magneto-Raman scattering measurements performed on graphene-like locations on the surface of bulk graphite, carries the energyite reveal a new series of magneto-phonon resonances involving both K point and Gamma point phonons. These are resonances between a purely electronic excitation, an electronic excitation accompanied by one phonon, and a two-phonon excitation. In particular, we observe the resonant splitting of three crossing excitation branches. We give a detailed theoretical analysis of these multi-excitation resonances. Our results highlight the role of combined excitations and the importance of multi-phonon processes (from bothK and G points) for the relaxation of hot carriers in graphene.
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