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O: Fachverband Oberflächenphysik
O 99: Post-Deadline Session
O 99.3: Vortrag
Donnerstag, 21. März 2024, 19:54–20:06, H 0105
Free-electron billiards in an ultrafast electron microscope — •Rudolf Haindl1,2, Lisa Beimel1,2, Armin Feist1,2, Sergey V. Yalunin1,2, and Claus Ropers1,2 — 1Department of Ultrafast Dynamics, Max Planck Institute for Multidisciplinary Sciences, Göttingen — 24th Physical Institute – Solids and Nanostructures, University of Göttingen, Göttingen
Correlations between electrons are at the core of numerous phenomena in atomic, molecular, and solid-state physics. Recent experiments uncovered pronounced energy correlations among individual electrons in vacuum generated by pulsed photoemission [1,2]. In a femtosecond electron microscope beam, the resulting spectral and spatial features are characteristic of the number n of electrons in each pulse [1].
In this contribution [3], we present first experiments exploring collisions between single and double free-electron states. Employing time-structured photoemission, we characterize energy correlations as a function of the n=1 and n=2 pulse delay. We realize conditions for efficient energy exchange and identify a scenario reminiscent of billiards-like sequential scatterings. In the future, such controlled few-particle interactions hold promise for enhanced imaging and spectroscopy schemes, while also enabling fundamental studies probing free-electron entanglement.
[1] R. Haindl et al., Nat. Phys. 19, 1410-1417 (2023).
[2] S. Meier et al., Nat. Phys. 19, 1402-1409 (2023).
[3] R. Haindl et al., in preparation (2024).
Keywords: correlated electrons; Coulomb interactions; electron microscopy; photoemission; electron collisions