@article{392,
  keywords = {paper},
  author = {Rodolfo Del Sole and Lucia Reining and RW Godby},
  title = {GWT approximation for electron self-energies in semiconductors and insulators},
  abstract = {The widely used GW approximation for the self-energy operator of a system of interacting electrons may, in principle, be improved using an approximate vertex correction GAMMA. We estimate GAMMA using the local-density approximation. We report the results of a comparable series of GW calculations for the band structure of silicon, in which such a vertex correction is (i) excluded entirely, (ii) included only in the screened Coulomb interaction W, and (iii) included in both W and the expression for the self-energy. We also discuss the symmetry properties of the exact vertex correction and how they may be retained in further improvements.},
  year = {1994},
  journal = {Phys. Rev. B},
  volume = {49},
  number = {12},
  pages = {8024-8028},
  month = {MAR 15},
  publisher = {AMERICAN PHYSICAL SOC},
  address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA},
}