Breit-Wigner-Fano lineshapes in Raman spectra of graphene
  Excitation of electron-hole pairs in the vicinity of the Dirac cone by the Coulomb interaction gives rise to an asymmetric Breit-Wigner-Fano lineshape in the phonon Raman spectra in graphene. This asymmetric lineshape appears due to the interference effect between the phonon spectra and the electron-hole pair excitation spectra. The calculated Breit-Wigner-Fano asymmetric factor 1/qBWF as a function of the Fermi energy shows a V-shaped curve with a minimum value at the charge neutrality point and gives good agreement with the experimental result. 
Eddwi H. Hasdeo, Ahmad R. T. Nugraha, Mildred S. Dresselhaus, and   Riichiro Saito
cond-mat.mes-hall