title: Observation of magnetophonon resonance of Dirac fermions in graphite.
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.
authors.affiliation: Department of Physics, Columbia University, New York, New York 10027, USA.
authors.forename: Jun
authors.initials: J
authors.lastname: Yan
authors.forename: Sarah
authors.initials: S
authors.lastname: Goler
authors.forename: Trevor D
authors.initials: TD
authors.lastname: Rhone
authors.forename: Melinda
authors.initials: M
authors.lastname: Han
authors.forename: Rui
authors.initials: R
authors.lastname: He
authors.forename: Philip
authors.initials: P
authors.lastname: Kim
authors.forename: Vittorio
authors.initials: V
authors.lastname: Pellegrini
authors.forename: Aron
authors.initials: A
authors.lastname: Pinczuk