Toward a systematic 1/d expansion: Two particle properties
Strongly Correlated Electrons
2009-10-31 v1
Abstract
We present a procedure to calculate 1/d corrections to the two-particle properties around the infinite dimensional dynamical mean field limit. Our method is based on a modified version of the scheme of Ref. onlinecite{SchillerIngersent}}. To test our method we study the Hubbard model at half filling within the fluctuation exchange approximation (FLEX), a selfconsistent generalization of iterative perturbation theory. Apart from the inherent unstabilities of FLEX, our method is stable and results in causal solutions. We find that 1/d corrections to the local approximation are relatively small in the Hubbard model.
Cite
@article{arxiv.cond-mat/0002073,
title = {Toward a systematic 1/d expansion: Two particle properties},
author = {Gergely Zarand and Daniel L. Cox and Avraham Schiller},
journal= {arXiv preprint arXiv:cond-mat/0002073},
year = {2009}
}
Comments
4 pages, 4 eps figures, REVTeX