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Motivated by a number of recent experimental studies we have carried out the microscopic calculation of the quasiparticle self-energy and spectral function in a doped graphene
when a symmetry breaking of the sublattices is occurred. Our systematic
study is based on the many-body G$_0$W approach that is established upon the random-phase-approximation and on graphene's massless Dirac equation continuum model. We report extensive calculations of both the
real and imaginary parts of the quasiparticle self-energy in the presence of a gap opening.
We present the effect of gap values for ground state properties, polarization function and charge compressibility. We also present results for inelastic scattering
rate, spectral function, renormalized Fermi
velocity and band gap renormalization of massive Dirac Fermions over a broad
range of electron densities.
Finally we conclude that the inclusion of both
the correlation and the band gap effects is indeed
crucial to get reasonable feature for the spectral function.
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