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 1098-0121Full text not available from this repository.
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.
|Copyright, Publisher and Additional Information:||© 1994 American Physical Society.|
|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|
|Publisher:||American Physical Society|
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