Dynamical vertex approximation - a step beyond dynamical mean field theory

Details Dynamical vertex approximation - a step beyond dynamical mean field theory Dynamical vertex approximation - a step beyond dynamical mean field theory

2006-03-05

arxiv.org/abs/cond-mat/0603100v2

Phys. Rev. B 75, 045118 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.75.045118

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.

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