title: Measurement of filling-factor-dependent magnetophonon resonances in graphene using Raman spectroscopy.
abstract: We perform polarization-resolved Raman spectroscopy on graphene in magnetic fields up to 45 T. This reveals a filling-factor-dependent, multicomponent anticrossing structure of the Raman G peak, resulting from magnetophonon resonances between magnetoexcitons and E(2g) phonons. This is explained with a model of Raman scattering taking into account the effects of spatially inhomogeneous carrier densities and strain. Random fluctuations of strain-induced pseudomagnetic fields lead to increased scattering intensity inside the anticrossing gap, consistent with the experiments.
authors.affiliation: National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA.
authors.forename: Y
authors.initials: Y
authors.lastname: Kim
authors.forename: J M
authors.initials: JM
authors.lastname: Poumirol
authors.forename: A
authors.initials: A
authors.lastname: Lombardo
authors.forename: N G
authors.initials: NG
authors.lastname: Kalugin
authors.forename: T
authors.initials: T
authors.lastname: Georgiou
authors.forename: Y J
authors.initials: YJ
authors.lastname: Kim
authors.forename: K S
authors.initials: KS
authors.lastname: Novoselov
authors.forename: A C
authors.initials: AC
authors.lastname: Ferrari
authors.forename: J
authors.initials: J
authors.lastname: Kono
authors.forename: O
authors.initials: O
authors.lastname: Kashuba
authors.forename: V I
authors.initials: VI
authors.lastname: Fal'ko
authors.forename: D
authors.initials: D
authors.lastname: Smirnov