SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 8: Ultrafast Electron Dynamics at Surface and Interfaces I
O 8.1: Vortrag
Montag, 27. März 2023, 10:30–10:45, TRE Phy
Coulomb-correlated few-electron states from a laser-driven Schottky emitter — •Rudolf Haindl1,2, Armin Feist1,2, Till Domröse1,2, Marcel Möller1,2, Sergey V. Yalunin1,2, and Claus Ropers1,2 — 1Max Planck Institute for Multidisciplinary Sciences, Göttingen — 24th Physical Institute, University of Göttingen
Observing correlation phenomena for free electrons requires a highly confined emission source, readily available by femtosecond photoemission from nanotips [1,2], and can in principle be studied using the supreme beam control provided by electron microscopes [3]. However, ensemble-averaged detection usually prevents studying multi-particle correlations in free-electron beams.
In this work, we use event-based electron microscopy to characterize laser-triggered few-electron pulses generated at a Schottky field emitter [4]. We find surprisingly strong energy correlations of about 2 eV in the two- and three-electron states hinting at a correlated emission process. Furthermore, state-sorted beam caustics show characteristic transverse pair distributions, as well as an increase and a longitudinal shift of the source.
Inducing strong few-electron Coulomb correlations facilitates non-Poissonian electron pulse statistics, promising applications in free-electron quantum optics.
[1] P. Hommelhoff, et al., Phys. Rev. Lett. 96, 077401 (2006).
[2] C. Ropers, et al., Phys. Rev. Lett. 98, 043907 (2007).
[3] A. Feist, et al., Ultramicroscopy 176, 63-73 (2017).
[4] R. Haindl, et al., arXiv:2209.12300 (2022).