Self-interaction correction to GW approximation
Journal
Physica Scripta
Journal Volume
86
Journal Issue
6
Date Issued
2012
Author(s)
Abstract
A general approach to correct the self-interaction error in GW approximation is proposed, and proved to be exact in the one-electron limit. The correction is expressed by vertex corrections to both the self-energy and the polarization, and the formulation can be shown to be equivalent to the Schneider-Taylor-Yaris approximation of many-body scattering theory. The suitability of this correction in many-electron systems is also discussed. Numerical calculations of the two-electron two-site Hubbard model are performed to illustrate the effects of the self-interaction correction on many-electron systems. © 2012 The Royal Swedish Academy of Sciences.
Type
journal article