Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 36: Poster: Ultrafast Electron Dynamics at Surfaces and Interfaces

O 36.22: Poster

Tuesday, March 19, 2024, 18:00–20:00, Poster C

Time-of-flight momentum microscopy for subcycle time-resolved photoemission — •Sarah Zajusch, Suguru Ito, Lasse Münster, Jens Güdde, Robert Wallauer, and Ulrich Höfer — Philipps-Universität Marburg

Time-of-flight momentum microscopy enables the simultaneous acquisition of energy and momentum distribution within the complete photoemission horizon. Thus, this technique paves the way to trace for example all exciton formations in TMD materials [1] and orbital images on ultrafast timescales [2]. In order to also investigate subcycle dynamics such as lightwave-driven currents in topological surface bands [3], we have to face additional challenges like photoelectron streaking and multi-hit detection.

Here, we present how photoelectron streaking affects time-of-flight experiments and how it can be compensated in the post processing. In addition, depending on pump frequency and field strength, it can be necessary to include a real-time streaking correction during the running experiment. We also show how multi-hit detection can be realized while maintaining good measurement performance.
[1] R. Wallauer et al., Nano Lett. 21, 13, 5867-5873 (2021).
[2] R. Wallauer et al., Science 371, 1056-1059 (2021).
[3] S. Ito et al., Nature 616, 696 (2023).

Keywords: ARPES; Momentum Microscopy; Subcycle; Photoelectron streaking; Multi-hits