Observation of magnetophonon resonance of dirac fermions in graphite

Jun Yan, Sarah Goler, Trevor D. Rhone, Melinda Han, Rui He, Philip Kim, Vittorio Pellegrini, Aron Pinczuk

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

Abstract

Coherent coupling of Dirac fermion magnetoexcitons with an optical phonon is observed in graphite as marked magnetic-field dependent splittings and anticrossing behavior of the two coupled modes. The sharp magnetophonon 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.

Original languageEnglish
Article number227401
JournalPhysical Review Letters
Volume105
Issue number22
DOIs
StatePublished - Nov 24 2010

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