Speaker
Description
Time- and angle-resolved photoemission spectroscopy (ARPES) is an ideal experimental technique to access the transient electronic structure of quantum materials. Moreover, the simulation of ARPES spectra can be well achieved by calculating the spectral function through Green’s function-based methods.
Here I will exemplify how quantum material can be probed with time-resolved ARPES using two recent results from our laboratory at the University of Fribourg, with a focus on optical control. First, I will show how a tailored optical pulse can be used to generate a band inversion in a semiconductor to create a transient topological cone through Floquet engineering. Second, I will discuss how a resonant generation of excitons in a small gap semiconductor allows us to follow their decoherence into dark excitons.