title: Charge tuning of nonresonant magnetoexciton phonon interactions in graphene.
abstract: Far from resonance, the coupling of the G-band phonon to magnetoexcitons in single layer graphene displays kinks and splittings versus filling factor that are well described by Pauli blocking and unblocking of inter- and intra-Landau level transitions. We explore the nonresonant electron-phonon coupling by high-magnetic field Raman scattering while electrostatic tuning of the carrier density controls the filling factor. We show qualitative and quantitative agreement between spectra and a linearized model of electron-phonon interactions in magnetic fields. The splitting is caused by dichroism of left- and right-handed circular polarized light due to lifting of the G-band phonon degeneracy, and the piecewise linear slopes are caused by the linear occupancy of sequential Landau levels versus ν.
authors.affiliation: Boston University, Department of Physics, 590 Commonwealth Avenue, Boston, Massachusetts 02215, USA.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Rémi
authors.affiliation: Boston University, Department of Physics, 590 Commonwealth Avenue, Boston, Massachusetts 02215, USA and Boston University, Department of Electrical and Computer Engineering, Boston, Massachusetts 02215, USA and Boston University, Photonics Center, 8 St. Mary's St, Boston, Massachusetts 02215, USA.
authors.forename: Bennett B
authors.initials: BB
authors.lastname: Goldberg
authors.affiliation: Boston University, Department of Physics, 590 Commonwealth Avenue, Boston, Massachusetts 02215, USA and Boston University, Department of Electrical and Computer Engineering, Boston, Massachusetts 02215, USA and Boston University, Photonics Center, 8 St. Mary's St, Boston, Massachusetts 02215, USA.
authors.forename: Anna K
authors.initials: AK
authors.lastname: Swan