Effect of Holstein phonons on the optical conductivity of gapped graphene

Details Effect of Holstein phonons on the optical conductivity of gapped graphene Effect of Holstein phonons on the optical conductivity of gapped graphene

2009-11-17

arxiv.org/abs/0911.3245v1

Eur. Phys. J. B 73, 247 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages, 4 figures. To appear in Eur. Phys. J. B

Scientific paper

We study the optical conductivity of a doped graphene when a sublattice symmetry breaking is occurred in the presence of the electron-phonon interaction. Our study is based on the Kubo 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 constants. Finally we conclude that the inclusion of the renormalized Fermi energy and the band gap effects are indeed crucial to get reasonable feature for the optical conductivity.

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