Self-consistent ladder dynamical vertex approximation
Josef Kaufmann, Christian Eckhardt, Matthias Pickem, Motoharu Kitatani, Anna Kauch, Karsten Held
Abstract
The dynamical vertex approximation and related methods represent a great leap forward in the description of nonlocal electronic correlations. It is based on a local two-particle irreducible vertex, from which the momentum-dependent self-energy is constructed via Bethe-Salpeter and Schwinger-Dyson equations. In this paper, the hitherto used one-shot calculations are improved by repeating these equations with feedback from the updated self-energy until self-consistency. The validity of the method is benchmarked by several numerical examples and, prominently, the formation of a pseudogap is demonstrated.
Topics & Concepts
Hubbard modelVertex (graph theory)Dynamical mean field theoryPhysicsStatistical physicsAb initioSelf consistentMean field theoryZero temperatureCondensed matter physicsSelf-energyQuantum mechanicsQuantum electrodynamicsSuperconductivityMathematicsCombinatoricsElectronGraphPhysics of Superconductivity and MagnetismMagnetic and transport properties of perovskites and related materialsAdvanced Condensed Matter Physics