Charge tuning of nonresonant magnetoexciton phonon interactions in graphene

Sebastian Rémi*, Bennett B. Goldberg, Anna K. Swan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

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.

Original languageEnglish (US)
Article number056803
JournalPhysical review letters
Volume112
Issue number5
DOIs
StatePublished - Feb 7 2014

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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