Godby, R.W., Pollehn, T.J. and Schindlmayr, A. (1998) Assessment of the GW Approximation using Hubbard Chains. Journal of Physics: Condensed Matter. pp. 1273-1283. ISSN 1361-648X
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.
|Copyright, Publisher and Additional Information:||© 1997 Institute of Physics. Published in Journal of Physics: Condensed Matter and uploaded in accordance with the publisher's self archiving policy.|
|Institution:||The University of York|
|Academic Units:||The University of York > Physics (York)|
|Depositing User:||Physics Import|
|Date Deposited:||29 Sep 2008 09:54|
|Last Modified:||26 Mar 2015 07:36|