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

Sole, R.D., Reining, L. and Godby, R.W. (1994) The GWΓ approach to electron self-energies in semiconductors and insulators. Physical Review B, 49 (12). pp. 8024-8028. ISSN 1098-0121

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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 Γ. We estimate Γ 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.

Item Type: Article
Copyright, Publisher and Additional Information: © 1994 American Physical Society.
Institution: The University of York
Academic Units: The University of York > Physics (York)
Depositing User: Physics Import
Date Deposited: 25 Sep 2008 10:03
Last Modified: 25 Sep 2008 10:03
Published Version: http://link.aps.org/abstract/PRB/v49/p8024
Status: Published
Publisher: American Physical Society
Refereed: Yes
Identification Number: 10.1103/PhysRevB.49.8024
Related URLs:
URI: http://eprints.whiterose.ac.uk/id/eprint/3983

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