The theory group studies the interplay of spin and charge degrees of freedom in correlated materials and their coherent control in equilibrium and nonequilibrium. We are concerned with the influence of dynamical screening of local moments via the so-called Kondo effect on current-voltage characteristics or with inelastic contributions to scanning tunneling spectroscopy on mol­ecules. The modeling of the emergence of free magnetic degrees of freedom in multi-perturbation problems also belongs to our range of topics, as does the theoretical simulation of the effect of laser pulses on electron and nuclear spins in ensembles of quantum dots, where spin noise leads to the decoherence of a pulse-driven spin dynamics. The latter activities are located in the Collaborative Research Center TRR 160, and are studied on the supercomputers at For­schungs­zen­trum Jülich."