Location of Repository

Assessment of the GW Approximation using Hubbard Chains

By R.W. Godby, T.J. Pollehn and A. Schindlmayr

Abstract

We investigate the performance of the GW approximation by comparison to exact results for small model systems. The role of the chemical potentials in Dyson's equation as well as the consequences of numerical resonance broadening are examined, and we show how a proper treatment can improve computational implementations of many-body perturbation theory in general. GW and exchange-only calculations are performed over a wide range of fractional band fillings and correlation strengths. We thus identify the physical situations where these schemes are applicable

Year: 1998
OAI identifier: oai:eprints.whiterose.ac.uk:3997

Suggested articles

Preview


To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.