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O: Fachverband Oberflächenphysik

O 44: Ultrafast Electron Dynamics II (joint session O/MA)

O 44.5: Vortrag

Dienstag, 17. März 2020, 11:45–12:00, WIL B321

Radio frequency controlled electron pulses for time-resolved LEED — •Dennis Epp, Marcel Möller, Gero Storeck, and Claus Ropers — IV. Physical Institute, University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen

Solid state surface systems display complex structural and electronic phases, with properties that may drastically differ from the bulk [1]. The coupling between electronic, lattice and spin degrees of freedom can be studied by ultrafast techniques. The recently developed method of Ultrafast Low-Energy Electron Diffraction (ULEED) is suitable for studying such structural dynamics on surfaces [2,3,4]. In this stroboscopic method, miniaturised laser-driven photoelectron sources generate ultrashort low-energy electron pulses to probe pump-induced changes to the surface structure [2,3], with a temporal resolution down to 1 ps. This contribution will focus on the characterization and control of low-energy electron beams by radio-frequency fields. First measurements of the beam properties resolved by a streaking field and further strategies for pulse compression will be discussed. [1] J. M. Kosterlitz. & D. J. Thouless, J. Phys. C 6, 1181*1203 (1973). [2] G. Storeck et al., Structural Dynamics 4, 044024 (2017). [3] S. Vogelgesang, et al., Nature Physics 14,184-190 (2018). [4] G. Horstmann et al., in preparation.