Journal
PHYSICAL REVIEW B
Volume 86, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.86.125114
Keywords
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Funding
- Austria Science Fund (FWF) through Research Unit [FOR: 1346, I597-N16]
- Austria Science Fund (FWF) through Austria-Russia joint Project [I610-N16]
- Austrian Science Fund (FWF) [I 610] Funding Source: researchfish
- Austrian Science Fund (FWF) [I610] Funding Source: Austrian Science Fund (FWF)
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Electronic-correlated systems are often well described by dynamical mean field theory (DMFT). While DMFT studies have mainly focused hitherto on one-particle properties, valuable information is also enclosed into local two-particle Green's functions and vertices. They represent the main ingredient to compute momentum-dependent response functions at the DMFT level and to treat nonlocal spatial correlations at all length scales by means of diagrammatic extensions of DMFT. The aim of this paper is to present a DMFT analysis of the local reducible and irreducible two-particle vertex functions for the Hubbard model in the context of a unified diagrammatic formalism. An interpretation of the observed frequency structures is also given in terms of perturbation theory, of the comparison with the atomic limit, and of the mapping onto the attractive Hubbard model.
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