Momentum and energy scattering processes of hot charge and spin carriers play a crucial role for many fundamental and device relevant phenomena ranging from photocatalysis and light harvesting to spin filtering at interfaces.

In our research, we particular focus on

• Momentum-dependent lifetime of electrons in metals
• Energy and momentum dissipation mechanisms of surface and interface states
• Spin injection phenomena at interfaces between low dimensional materials and magnetic surfaces

These studies are conducted using time-resolved 2-photon photoemission spectroscopy and time-resolved 2-photon momentum microscopy. In this pump-probe study, a first femtosecond laser pulse optically excites electrons in the excited state range while the second probe pulse photoexcites carriers into the vacuum at a well-defined time-delay where they are detected using state-of-the-art photoemission detector systems.