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Paper   IPM / P / 9566
School of Physics
  Title:   The Effect of Sublattice Symmetry Breaking on the Electronic Properties of Doped Graphene
1.  A. Qaiumzadeh
2.  R. Asgari
  Status:   Published
  Journal: New J. Phys.
  Vol.:  11
  Year:  2009
  Pages:   095023
  Supported by:  IPM
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 G0W 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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