Self-consistent ladder dynamical vertex approximation

Physical review. B./Physical review. B, vol. 103

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.

Authors 6

1. Josef Kaufmann

   TU Wien

   Affiliation as printed

   Institute of Solid State Physics, TU Wien, 1040 Vienna, Austria

2. Christian Eckhardt Aachen Institute for Theoretical Solid State Physics

   RWTH Aachen University · TU Wien

   Affiliation as printed

   Institute for Theoretical Solid State Physics, RWTH Aachen University, 52074 Aachen, Germany

   Institute of Solid State Physics, TU Wien, 1040 Vienna, Austria

3. Matthias Pickem

   TU Wien

   Affiliation as printed

   Institute of Solid State Physics, TU Wien, 1040 Vienna, Austria

4. Motoharu Kitatani

   RIKEN · RIKEN Center for Emergent Matter Science

   Affiliation as printed

   RIKEN Center for Emergent Matter Sciences (CEMS), Wako, Saitama 351-0198, Japan

5. Anna Kauch

   TU Wien

   Affiliation as printed

   Institute of Solid State Physics, TU Wien, 1040 Vienna, Austria

6. Karsten Held

   TU Wien

   Affiliation as printed

   Institute of Solid State Physics, TU Wien, 1040 Vienna, Austria