Author

A. Toschi

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Preprint Oct 2026

Dynamical vertex approximation for retarded interactions: Application to the Hubbard-Holstein model

We extend the dynamical vertex approximation (D$\Gamma$A), in its most commonly used ladder-version, to systems with retarded electronic interactions. Such an extended scheme, which we name"dynamical-$U$ D$\Gamma$A", allows us to study strongly interacting electrons coupled to bosons including non-local spatial correla...

Emin Moghadas, S. Giuli, M. Capone et al. · 0 citations

Preprint Sep 2026

Instabilities in self-consistent diagrammatic approaches and how to cure them

While self-consistent diagrammatic approaches are widely used to compute the physical properties of correlated quantum materials, their applicability may get severely hindered precisely in the parameter regions, where the most exciting physics is observed. One of the major issues, referred to as"misleading convergence"...

Marcel Gievers, Herbert Essl, Stefan Rohshap et al. · 0 citations