Our group studies the physical properties of quantum systems consisting
of a macroscopically large number of strongly interacting fermions.
These systems can show collective behavior that cannot be understood on
an independent-particle level.
The field covers collective magnetism, correlation-driven metal-insulator
transitions, high-temperature superconductivity and unconventional states
of matter in general.
We are interested in classical and quantum phase transitions in low-dimensional
lattice systems and nanostructures, in elementary excitation spectra and
in non-equilibrium phenomena.
The employed methods range from field-theoretical techniques and exact
diagonalization over (dynamical) mean-field theory and cluster techniques
to (quantum) Monte-Carlo methods and density-matrix renormalization group.
An important focus is on new methodical developments.
