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Evaluation of it GW approximations for the self-energy of a Hubbard cluster

Verdozzi, C., Godby, R.W. and Holloway, S. (1995) Evaluation of it GW approximations for the self-energy of a Hubbard cluster. Physical Review Letters, 74 (12). pp. 2327-2330. ISSN 0031-9007

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We evaluate several approximations for the self-energy operator and dielectric function of systems of interacting electrons using a two-dimensional Hubbard cluster for which the self-energy, dielectric function, and one-particle Green's function may be calculated exactly. The results show the GW approximation (in the form in which it is commonly used in ab initio calculations for real materials) to be relatively successful in establishing the main features of the spectrum, even when the electron-electron interaction is not weak. It is also clear that improving the G andW used in this approximation without including vertex corrections in the self-energy does not lead to major improvements.

Item Type: Article
Copyright, Publisher and Additional Information: © 1995 American Physical Society.
Institution: The University of York
Academic Units: The University of York > Physics (York)
Depositing User: Physics Import
Date Deposited: 25 Sep 2008 10:11
Last Modified: 25 Sep 2008 10:11
Published Version: http://link.aps.org/abstract/PRL/v74/p2327
Status: Published
Publisher: American Physical Society
Refereed: Yes
Identification Number: 10.1103/PhysRevLett.74.2327
Related URLs:
URI: http://eprints.whiterose.ac.uk/id/eprint/3988

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