Dynamical vertex approximation - a step beyond dynamical mean field theory
Strongly Correlated Electrons
2009-11-11 v2
Abstract
We develop a diagrammatic approach with local and nonlocal self-energy diagrams, constructed from the local irreducible vertex. This approach includes the local correlations of dynamical mean field theory and long-range correlations beyond. It allows for example to describe (para-)magnons and weak localization effects in strongly correlated systems. As a first application, we study the interplay between nonlocal antiferromagnetic correlations and the strong local correlations emerging in the vicinity of a Mott-Hubbard transition.
Keywords
Cite
@article{arxiv.cond-mat/0603100,
title = {Dynamical vertex approximation - a step beyond dynamical mean field theory},
author = {A. Toschi and A. A. Katanin and K. Held},
journal= {arXiv preprint arXiv:cond-mat/0603100},
year = {2009}
}
Comments
4 pages, 3 figures