Observation of magneto-phonon resonance of Dirac fermions in graphite

Details Observation of magneto-phonon resonance of Dirac fermions in graphite Observation of magneto-phonon resonance of Dirac fermions in graphite

2010-08-06

arxiv.org/abs/1008.1206v1

Physics

Condensed Matter

Materials Science

5 figures, supplementary material section included

Scientific paper

Coherent coupling of Dirac fermion magneto-excitons with an optical phonon is observed in graphite as marked magnetic-field dependent splittings and anti-crossing behavior of the two coupled modes. The sharp magneto-phonon resonance occurs in regions of the graphite sample with properties of superior single-layer graphene having enhanced lifetimes of Dirac fermions. The greatly reduced carrier broadening to values below the graphene electron-phonon coupling constant explains the appearance of sharp resonances that reveal a fundamental interaction of Dirac fermions.

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