The crossover from fluctuating atomic constituents to a collective state as one lowers
temperature or energy is at the heart of the dynamical mean-field theory description of the …

We identify the precise hallmarks of the local magnetic moment formation and its Kondo
screening in the frequency structure of the generalized charge susceptibility. The sharpness …

We present and implement a parquet approximation within the dual-fermion formalism
based on a partial bosonization of the dual vertex function which substantially reduces the …

We present a decomposition of the two-particle vertex function of the single-band Anderson
impurity model which imparts a physical interpretation of the vertex in terms of the exchange …

Dynamical Mean-Field Theory (DMFT) has opened new perspectives for the investigation of
strongly correlated electron systems and greatly improved our understanding of correlation …

The many-body problem is usually approached from one of two perspectives: the first
originates from an action and is based on Feynman diagrams, the second is centered …

While the breakdown of the perturbation expansion for the many-electron problem has
several formal consequences, here we unveil its physical effect: flipping the sign of the …

We study the physics of high-temperature cuprate superconductors starting from the highly
degenerate four-site plaquette of the t− t′− U Hubbard model as a reference system. The …

The recently introduced single-boson exchange (SBE) decomposition of the four-point
vertex of interacting fermionic many-body systems is a conceptually and computationally …

Taking the competition and the mutual screening of various bosonic fluctuations in
correlated electron systems into account requires an unbiased approach to the many-body …