Welcome to the Dynamics of Correlated Materials group!
We are an experimental research group focusing on the investigation of ultrafast processes in strongly correlated materials. Our goal is the understanding of the fundamental interactions at play on the microscopic level in such materials, leading to complex behavior. We develop and employ complementary ultrafast techniques such as time- and angle-resolved photoelectron spectroscopy (trARPES) and time-resolved diffraction techniques to study those elementary interaction processes and couplings across ultrafast phase transitions.
Using the free-electron laser Flash at Desy in Hamburg in conjunction with a time-of-fligh momentum microscope, we were able to track the time-dependent electronic structure of the layered semiconductor WSe2 on an ultrafast timescale. Our findings demonstrate a novel, at first glance counter-intuitive approach for accessing exciton and QFC dynamics on ultrafast time scales: the photoemission lineshapes of core levels, i.e. states deep below the frontier orbitals, turn out to be sensitive probes of the electron dynamics occurring in the valence and conduction band. [more...]