Assessment of the GW Approximation using Hubbard Chains

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

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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.
Original languageEnglish
Pages (from-to)1273-1283
Number of pages10
JournalJournal of Physics: Condensed Matter
Issue number6
Publication statusPublished - 16 Feb 1998

Bibliographical note

© 1997 Institute of Physics. Published in Journal of Physics: Condensed Matter and uploaded in accordance with the publisher's self archiving policy.

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