TY - JOUR
T1 - Charge tuning of nonresonant magnetoexciton phonon interactions in graphene
AU - Rémi, Sebastian
AU - Goldberg, Bennett B.
AU - Swan, Anna K.
PY - 2014/2/7
Y1 - 2014/2/7
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevLett.112.056803
DO - 10.1103/PhysRevLett.112.056803
M3 - Article
C2 - 24580621
AN - SCOPUS:84894429285
SN - 0031-9007
VL - 112
JO - Physical review letters
JF - Physical review letters
IS - 5
M1 - 056803
ER -