Regensburg 2025 – scientific programme

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O: Fachverband Oberflächenphysik

O 7: Focus Session Ultrafast Electron Microscopy at the Space-Time Limit I

O 7.8: Talk

Monday, March 17, 2025, 12:30–12:45, H11

Momentum microscopy with attosecond time resolution at ELI ALPS to map the full Brillouin zone — Gyula Halasi¹, Csaba Vass¹, Nikolett Oláh¹, Zoltán Filus¹, Tímea Grósz¹, Chinmoy Biswas¹, Tamás Csizmadia¹, Lénárd Gulyás Oldal¹, Balázs Major¹, Péter Jójárt¹, Felix Blödorn², Florian Simperl², Aref Imani², Paolo Carpeggiani², Péter Dombi¹, Wolfgang S.M. Werner², Alessandra Bellissimo², and •László Óvári¹ — ¹ELI ALPS, Szeged, Hungary — ²Vienna University of Technology, Austria

Time-resolved photoemission is a highly efficient tool for unraveling surface electron dynamics. The coupling of a photoemission electron microscope (PEEM) with an imaging hemispherical analyzer in our NanoESCA end station allows for the combination of spectroscopy and microscopy in real or momentum space. The NanoESCA end station is attached to a high harmonic generation (HHG) beamline, hence time-resolved momentum microscopy studies can be performed in a pump-probe scheme. To illustrate the performance of our user-ready system, the first results obtained by the RABBITT (Reconstruction of Attosecond Beating By Interference of Two-photon Transitions) scheme are presented. In this experiment, a graphite(0001) single crystal was studied, and RABBITT oscillations have been identified throughout the whole Brillouin zone, with attosecond precision, in the form of a time-resolved momentum space movie.

Keywords: momentum microscopy; ARPES; attosecond; RABBITT; graphite