Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 37: Ultrafast electron dynamics at surface and interfaces – Poster (joint session O/TT)
TT 37.7: Poster
Dienstag, 10. März 2026, 14:00–16:00, P2
Time-resolved PEEM and µARPES using a 100 kHz ToF momentum microscope — •Isabella Alexandra Hofmeister1,2, Michael Herb1,2, Maria Federl1, Franz Seitz1, and Isabella Gierz1,2 — 1University of Regensburg, Regensburg, Germany — 2Regensburg Center for Ultrafast Nanoscopy - RUN, Regensburg, Germany
Momentum microscopy provides energy-resolved imaging in real and reciprocal space with <100 meV resolution, combining PEEM (Δx <40 nm lateral resolution) and µARPES (Δk < 0.02 Å−1) capabilities. We implemented an ultrafast setup with a time-of-flight momentum microscope and a 100 kHz laser system delivering 6 eV probe pulses and pump pulses tunable from the mid-infrared to visible range. Procedures for converting time-of-flight to kinetic energy and for establishing spatial and temporal pump-probe overlap are discussed. Proof-of-principle time-resolved PEEM and µARPES experiments on the topological insulator Bi2Se3 demonstrate femtosecond-resolved carrier dynamics with high spatial and momentum precision.
Keywords: ToF-PEEM; µARPES; pump-probe; ultrafast carrier dynamics; topological insulator