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 37.20: Poster
Dienstag, 10. März 2026, 14:00–16:00, P2
Multimode momentum microscopy of cleaved 1T-TaS2 crystals — •Bent van Wingerden1, Olena Tkach2, Hashima Marukara1, Jan Philipp Bange1, Wiebke Bennecke1, Marcel Reutzel3, Junde Liu1, Gerd Schönhense2, and Stefan Mathias1 — 1Georg-August-Universität Göttingen, Germany — 2Johannes Gutenberg-Universität Mainz, Germany — 3Philipps-Universität Marburg, Germany
Ultrafast momentum microscopy has evolved as one of the most powerful tools to study non-equilibrium electronic structure dynamics of 2D quantum materials [1]. However, the large electric field strength generated by the immersion lens limits its versatility in terms of sample systems. One critical issue is related to vacuum-cleaved van-der-Waals-crystals that often show microscopic protrusions, which are prone to field-induced electron emission and flashovers, both of which can destroy the sample itself as well as the microscope’s electronics.
In our work, we test the momentum imaging capabilities of a newly designed multimode momentum microscope [2,3] in combination with an EUV table-top HHG source. Using vacuum-cleaved bulk crystals of 1T-TaS2, we show that operating in modes of reduced electric field strength at the sample position suppresses field emission, while still preserving the field-of-view and imaging quality. We carry out detailed comparisons of different operating modes with the new lens system.
[1] Reutzel, Jansen, Mathias, Adv. in Phys. X 9, 2378722 (2024).
[2] Tkach & Schönhense, Ultramicroscopy 276, 114167 (2025).
[3] Tkach et al., arXiv:2401.10084 (2024).
Keywords: Ultrafast momentum microscopy; trARPES; TaS2