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Keywords:

  • second-order Raman scattering in graphene;
  • optical conductivity of graphene

Abstract

The triple-resonant (TR) second-order Raman scattering mechanism in graphene is re-examined. It is shown that the magnitude of the TR contribution to the photon-G′ mode coupling function in graphene is one order of magnitude larger than the widely accepted two-resonant coupling. Enhancement of the order of 100 in the Raman intensity, with respect to the usual double-resonant model, is found for the G′ band in graphene, and is expected in the related sp2-based carbon materials, as well. Copyright © 2011 John Wiley & Sons, Ltd.