Systematic vertex corrections through iterative solution of Hedin's equations beyond the it GW approximation

Godby, R.W. and Schindlmayr, A. (1998) Systematic vertex corrections through iterative solution of Hedin's equations beyond the it GW approximation. Physical Review Letters. pp. 1702-1705. ISSN 0031-9007

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Abstract

We present a general procedure for obtaining progressively more accurate functional expressions for the electron self-energy by iterative solution of Hedin's coupled equations. The iterative process starting from Hartree theory, which gives rise to the GW approximation, is continued further, and an explicit formula for the vertex function from the second full cycle is given. Calculated excitation energies for a Hubbard Hamiltonian demonstrate the convergence of the iterative process and provide further strong justification for the GW approximation.

Item Type:	Article
Copyright, Publisher and Additional Information:	© 1998 American Physical Society. Published in Physical Review Letters and uploaded in accordance with the publisher's self archiving policy.
Academic Units:	The University of York > Physics (York)
Depositing User:	Physics Import
Date Deposited:	29 Sep 2008 09:55
Last Modified:	19 Feb 2013 12:08
Published Version:	http://dx.doi.org/10.1103/PhysRevLett.80.1702
Status:	Published
Refereed:	Yes
Related URLs:	http://arxiv.org/abs/cond-mat/9710295 http://link.aps.org/abstract/PRL/v80/p17...
URI:	http://eprints.whiterose.ac.uk/id/eprint/4002

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