The GW approximation in electronic structure theory has become a widespread tool for
predicting electronic excitations in chemical compounds and materials. In the realm of …

Strong electronic correlations pose one of the biggest challenges to solid state theory.
Recently developed methods that address this problem by starting with the local, eminently …

Numerical results for ground-state and excited-state properties (energies, double
occupancies, and Matsubara-axis self-energies) of the single-orbital Hubbard model on a …

This report addresses topics and questions of common interest in the fields of ultra-cold
gases and nuclear physics in the context of the BCS–BEC crossover. By this crossover, the …

The Hubbard model represents the fundamental model for interacting quantum systems and
electronic correlations. Using the two-dimensional half-filled Hubbard model at weak …

We introduce a method for summing Feynman's perturbation series based on diagrammatic
Monte Carlo that significantly improves its convergence properties. This allows us to …

We demonstrate how to identify which physical processes dominate the low-energy spectral
functions of correlated electron systems. We obtain an unambiguous classification through …

Vertex functions are a crucial ingredient of several forefront many-body algorithms in
condensed matter physics. However, the full treatment of their frequency and momentum …

Starting from the (Hubbard) model of an atom, we demonstrate that the uniqueness of the
mapping from the interacting to the noninteracting Green function, G→ G 0, is strongly …

We compute the electronic Green's function of the topologically ordered Higgs phase of a
SU (2) gauge theory of fluctuating antiferromagnetism on the square lattice. The results are …