Doping dependence of the Raman spectrum of defected graphene
  We investigate the evolution of the Raman spectrum of defected graphene as a function of doping. Polymer electrolyte gating allows us to move the Fermi level up to 0.7eV, as monitored by \textit{in-situ} Hall-effect measurements. For a given number of defects, we find that the intensities of the D and D' peaks decrease with increasing doping. We assign this to an increased total scattering rate of the photoexcited electrons and holes, due to the doping-dependent strength of electron-electron scattering. We present a general relation between D peak intensity and defects valid for any doping level 
M. Bruna, A. K. Ott, M. Ijas, D. Yoon, U. Sassi, A. C. Ferrari
cond-mat.mtrl-sci cond-mat.mes-hall