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O: Fachverband Oberflächenphysik

O 42: Electronic structure of surfaces: Spectroscopy, surface states – Poster

O 42.8: Poster

Dienstag, 10. März 2026, 14:00–16:00, P2

Excitation of spin-polarized electrons by Deep-UV Pulses with Orbital Angular Momentum from Au(111) and Cu(111) — •Ruwen Quenter, Paul valerian Möllers, and Helmut Zacharias — Center for Soft Nanoscience (SoN), University of Münster, Busso-Peus-Str. 10, 48149 Münster, Germany

Photoemission can, depending on the substrate and the circularly polarization of the light, result in a longitudinal spin polarisation of the excited electrons. The angular momentum of the light influences the final state determined by the selection rules in a way that corresponds to a specific total angular momentum. Spin-orbit interactions cause an energetical separation of states with different total angular momenta, resulting in a spin imbalance of the excited electrons. This can be measured by e.g. Mott scattering. Orbital angular momentum light has a helical wavefront that carries its orbital angular momentum as a degree of freedom wich may have an influence on the electron orbital angular momentum in the electron excitation process. Spin-resolved photoemission measurements could determine if this influence could result in a changed photoelectron spin polarization. We present preliminary results from measurements on Au(111) and Cu(111).

Keywords: spin; orbital angular momentum; Mott scattering; photoelectron spectroscopy; optical orientation