Dresden 2026 – scientific programme
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O: Fachverband Oberflächenphysik
O 66: Ultrafast electron dynamics at surface and interfaces III
O 66.6: Talk
Wednesday, March 11, 2026, 16:30–16:45, TRE/MATH
Electron Correlations in Ultrafast Transmission Electron Microscopy — •Nico Stumpp1, Andreas Wendeln1, Alexander Schröder1, and Sascha Schäfer1,2 — 1Department of Physics, University of Regensburg, Regensburg, Germany — 2Regensburg Center for Ultrafast Nanoscopy (RUN), Regensburg, Germany
Ultrafast transmission electron microscopy (UTEM) strives to combine an atomic spatial resolution with a femtosecond temporal resolution, yet its performance is inherently limited by Coulomb repulsion within electron pulses. Research in free-electron quantum optics suggests that, rather than avoiding these dynamic interactions, exploiting their induced inter-electron correlations offers a pathway toward quantum-limited imaging performance [1,2].
Utilizing an event-based electron detector with nanosecond temporal resolution, we observe pronounced energy anti-correlations in few-electron states emitted from a high-coherence, laser-driven cold field-emission electron source [3]. Crucially, we demonstrate the ability to actively modify the magnitude and visibility of the induced energy separation depending on angular post-selection. We complement our experimental results with numerical multi-particle simulations of electron pulse dynamics within the electrostatic gun environment, focussing on the interplay between strongly interacting correlated electron pairs and the surrounding electron ensemble of the emitted photoelectron bunch.
[1] R. Haindl et al., Nat. Phys. 19, 1410 (2023).
[2] S. Meier et. al., Nat. Phys. 19, 1402 (2023).
[3] A. Schröder et al., Ultramicroscopy 275, 114158 (2025).
Keywords: Ultrafast Transmission Electron Microscopy; Cold Field Emission Source; Electron-Electron-Correlations