The GWG approach to electron self-energies in semiconductors and insulators

R.W. Godby, R.D. Sole, L. Reining

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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 G. We estimate G 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.
Original languageEnglish
Pages (from-to)8024-8028
Number of pages4
JournalPhysical Review B
Issue number12
Publication statusPublished - 15 Mar 1994

Bibliographical note

© 1994 American Physical Society.

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