While the pseudogap dominates the phase diagram of hole-doped cuprates, connecting the
antiferromagnetic parent insulator at low doping to the strange metal at higher doping, its …

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 …

We present a purely diagrammatic derivation of the dual fermion scheme (Rubtsov et al.,
2008). The derivation makes particularly clear that a similar scheme can be developed for …

We have developed a strong-coupling perturbation scheme for a general doped Hubbard
model around a particle-hole-symmetric reference system, which is free from the fermionic …

We investigate the tetragonal phase of the binary transition metal oxide CuO (t-CuO) within
the context of cellular dynamical mean-field theory. Due to its strong antiferromagnetic …

We present the multi-band dual triply irreducible local expansion (D-TRILEX) approach to
interacting electronic systems and discuss its numerical implementation. This method is …

We investigate ultrafast coherent quantum dynamics of undoped Ba Bi O 3 driven by a
strong laser pulse. Our calculations demonstrate that in a wide range of radiation …

This thesis presents two robust numerical approaches to modelling the properties of systems
with strong electron-electron correlation. The Exact Diagonalization method (ED), whose …

In this lecture we give an introduction the to theoretical description of interacting electron
systems based on non-perturbative, strong-coupling expansions around optimal reference …

Strongly correlated materials exhibit a vast variety of complex phases and dynamics.
Understanding the mechanism behind the interplay of these phenomena are amongst the …