Charge Tuning of Nonresonant Magnetoexciton Phonon Interactions in Graphene

Sebastian Rémi, Bennett B. Goldberg, and Anna K. Swan
Phys. Rev. Lett. 112, 056803 – Published 7 February 2014
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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.

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  • Received 23 July 2013

DOI:https://doi.org/10.1103/PhysRevLett.112.056803

© 2014 American Physical Society

Authors & Affiliations

Sebastian Rémi1, Bennett B. Goldberg1,2,3, and Anna K. Swan2,1,3,*

  • 1Boston University, Department of Physics, 590 Commonwealth Avenue, Boston, Massachusetts 02215, USA
  • 2Boston University, Department of Electrical and Computer Engineering, Boston, Massachusetts 02215, USA
  • 3Boston University, Photonics Center, 8 St. Mary’s St, Boston, Massachusetts 02215, USA

  • *swan@bu.edu

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Issue

Vol. 112, Iss. 5 — 7 February 2014

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