Light-induced band structure engineering probed by photoelectron spectroscopy

On-demand engineering of condensed matter materials by external stimuli is a promising route for the dynamical control of physical and chemical properties. By applying a strong external perturbation, the driven system’s eigenstates are dependent on the crystal potential, and the periodicity of the external stimuli. In this contribution, I present two complementary case studies that facilitate the quantification of such light-engineered band structures using variants of photoelectron spectroscopy. I will exemplify the application of coherent two-dimensional photoelectron spectroscopy to resolve a dynamical band gap opening on the surface bands of Cu(111). Additionally, I will report on time-resolved momentum microscopy experiments on Au(111) that focus on the generation of light-engineered band structures throughout the full surface Brillouin zone.