Effect of Holstein phonons on the optical conductivity of gapped graphene |
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Authors: | Kh Jahanbani and R Asgari |
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Institution: | 1.Institute for Advanced Studies in Basic Sciences (IASBS),Zanjan,Iran;2.School of Physics, Institute for Fundamental Sciences, (IPM),Tehran,Iran |
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Abstract: | 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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Keywords: | |
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