Charge tuning of non-resonant magneto-exciton phonon interactions in graphene

Abstract

Far from resonance, the coupling of the G-band phonon to magneto-excitons 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 non-resonant 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 $\nu$.

5 pages, 3 figures

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Cited by in corpus (7)

• Dynamical Multiferroicity
• Gate dependent electronic Raman scattering in graphene
• Raman scattering of graphene based systems in high magnetic fields
• Electric field-induced valley degeneracy lifting in uniaxial strained graphene: evidence from magnetophonon resonance
• Observation of Giant Quantized Phonon Modes in Graphene via Tunneling Spectra
• Gauge theory of giant phonon magnetic moment in doped Dirac semimetals
• Ultra-low doping and local charge variation in graphene measured by Raman: experiment and simulation