Regensburg 2025 – scientific programme

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O: Fachverband Oberflächenphysik

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

Monday, March 17, 2025, 10:30–12:45, H11

Shaping functionalities on the nanoscale is one of the most essential challenges in modern condensed matter research. It requires a comprehensive understanding of the complex interplay of the electronic, spin, and lattice degrees of freedom in materials and requires tailoring energy transfer and dissipation pathways on the smallest length and fastest timescales. Recent instrumentation breakthroughs in different varieties of pump-probe ultrafast electron microscopy have opened the way for accessing electronic and structural dynamics at surfaces, interfaces, and nanostructures with down-to-attosecond resolution in time. While ultrafast photoemission electron microscopy techniques provide supreme sensitivity to spin and electron dynamics in real momentum space, bright ultrashort electron pulses in the ultrafast implementation of more traditional electron microscopes can probe optical states, local magnetization, and lattice dynamics with a nanometer spatial resolution.

This focus session highlights recent advances in ultrafast high-resolution electron probing. These include new instrumentation and techniques, excitations from the THz to X-ray regime, and studying novel phenomena and materials systems. At the same time, it will bring together researchers from the different areas of ultrafast condensed matter physics to foster discussions and new collaborations to explore emergent scientific questions in this field.

Organized by
Armin Feist (MPI Göttingen) and Benjamin Stadtmüller (University Augsburg).

	10:30	O 7.1	Ultrafast Low-Energy Electron Microscopy — •Johannes Otto, Leon Brauns, Benjamin Schröder, and Claus Ropers
	10:45	O 7.2	Ultrafast Electron Dynamics in Surface Plasmon Polariton Nanofoci — •Pascal Dreher, Alexander Neuhaus, Michael Horn-von Hoegen, and Frank Meyer zu Heringdorf
	11:00	O 7.3	Mechanisms and Dynamics of Electron Emission from Graphitic Surfaces: Insights from Correlated and Time-Resolved Spectroscopies — •Alessandra Bellissimo, Florian Simperl, Felix Blödorn, Wolfgang S.M. Werner, Gyula Halasi, László Óvári, Csaba Vass, Nikolett Oláh, Zoltán Filus, Tímea Grósz, Chinmoy Biswas, Balázs Major, Imre Seres, Aref Imani, Paolo A. Carpeggiani, Maosheng Hao, and Florian Libisch
	11:15	O 7.4	Invited Talk: Nanoimaging the electronic, plasmonic, and phononic structure and dynamics of 2D materials — •Sarah King
	11:45	O 7.5	Time-resolved momentum microscopy with fs-XUV photons at high repetition rates with flexible energy and time resolution — •Karl Schiller, Lasse Sternemann, Matija Stupar, Alan Omar, Martin Hoffmann, Jonah Nitschke, Valentin Mischke, David Janas, Stefano Ponzoni, Giovanni Zamborlini, Clara Saraceno, and Mirko Cinchetti
	12:00	O 7.6	Dark field photoelectron momentum microscopy of electric field gated 2D semiconductors — •Jan Philipp Bange, Bent van Wingerden, Jonas Pöhls, Wiebke Bennecke, Paul Werner, David Schmitt, AbdulAziz AlMutairi, Daniel Steil, R. Thomas Weitz, G. S. Matthijs Jansen, Stephan Hofmann, Giuseppe Meneghini, Samuel Brem, Ermin Malic, Marcel Reutzel, and Stefan Mathias
	12:15	O 7.7	Plasmonic spin meron pair: Spatio-temporal topology revealed by time resolved polarimetric photo-emission microscopy — Pascal Dreher, •Alexander Neuhaus, David Janoschka, Alexandra Roedl, Tim Meiler, Bettina Frank, Timothy J. Davis, Harald Giessen, and Frank Meyer zu Heringdorf
	12:30	O 7.8	Momentum microscopy with attosecond time resolution at ELI ALPS to map the full Brillouin zone — Gyula Halasi, Csaba Vass, Nikolett Oláh, Zoltán Filus, Tímea Grósz, Chinmoy Biswas, Tamás Csizmadia, Lénárd Gulyás Oldal, Balázs Major, Péter Jójárt, Felix Blödorn, Florian Simperl, Aref Imani, Paolo Carpeggiani, Péter Dombi, Wolfgang S.M. Werner, Alessandra Bellissimo, and •László Óvári