Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 34: Poster Tuesday: Scanning Probe Techniques 2
O 34.10: Poster
Dienstag, 6. September 2022, 11:00–13:00, P3
Multispectral time-resolved energy-momentum microscopy using high-harmonic extreme ultraviolet radiation — •Nils Wind1,2, Michael Heber3, Dmytro Kutnyakhov3, Federico Pressacco3, and Kai Rossnagel2,4 — 1Institut für Experimentalphysik, Universität Hamburg, 22761 Hamburg, Germany — 2Ruprecht-Haensel-Labor, Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany — 3Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany — 4Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
A 790-nm-driven high-harmonic generation source with a repetition rate of 6 kHz is combined with a toroidal-grating monochromator and a high-detection-efficiency photoelectron time-of-flight momentum microscope to enable time- and momentum-resolved photoemission spectroscopy over a spectral range of 23.6–45.5 eV with sub-100-fs time resolution. Three-dimensional (3D) Fermi surface mapping is demonstrated on graphene-covered Ir(111) with energy and momentum resolutions of 100 meV and 0.1 Å−1, respectively. The table-top experiment sets the stage for measuring the kz-dependent ultrafast dynamics of 3D electronic structure, including band structure, Fermi surface, and carrier dynamics in 3D materials as well as 3D orbital dynamics in molecular layers.