Toward a systematic 1/d expansion: Two particle properties

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.

4 pages, 4 eps figures, REVTeX

References in corpus (2)

• Nonlocal Dynamical Correlations of Strongly Interacting Electron Systems
• Melting of the Electron Glass

Cited by in corpus (4)

• A note on cluster methods for strongly correlated electron systems
• Cluster Dynamical Mean Field Theories
• Dynamical vertex approximation for the two-dimensional Hubbard model
• On the Analyticity of Solutions in the Dynamical Mean-Field Theory