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“School of Physic”

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Paper   IPM / Physic / 11178
School of Physics
  Title:   Effect of Holstein Phonons on the Optical Conductivity of Gapped Graphene
  Author(s): 
1.  kh. Jahanbani
2.  R. Asgari
  Status:   Published
  Journal: Eur. Phys. J. B
  Vol.:  73
  Year:  2010
  Pages:   247-252
  Supported by:  IPM
  Abstract:
We study the optical conductivity of a doped graphene when a symmetry breaking of the sublattices is occurred in the presence of electron-phonon interaction. Our study is based on the Kuba formula that is established upon the retarded self-energy. We report new features of both the real and imaginary parts of the quasiparticle self-energy in the presence of a gap opening. We find an analytical expression for the renormalized Fermi velocity of massive Dirac Fermions over broad ranges of electron densities, gap values and the electron-phonon coupling constant. Finally we conclude that the inclusion of the renormalized Fermi energy and the band gap effects is indeed crucial to get reasonable feature for the optical conductivity.

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