Berlin 2024 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 6: New Accelerator Concepts - Models and Experiments
AKBP 6.8: Vortrag
Dienstag, 19. März 2024, 12:45–13:00, E 020
Coulomb-correlated few-electron states from a laser-driven field emitter — •Armin Feist1,2, Rudolf Haindl1,2, Till Domröse1,2, Marcel Möller1,2, John H. Gaida1,2, Sergey V. Yalunin1,2, and Claus Ropers1,2 — 1Max Planck Institute for Multidisciplinary Sciences, Göttingen, DE — 24th Physical Institute, University of Göttingen, DE
Coulomb repulsion in charged particle beams and pulses is usually considered detrimental due to a stochastic emittance increase. An extreme limit for high-brightness few-electron pulses is the spatially confined femtosecond photoemission from field emitters [1,2] employed in ultrafast electron microscopes [3]. However, ensemble-averaged detection usually prevents studying correlations in free-electron beams.
Here, we use event-based electron microscopy to characterize laser-triggered few-electron pulses generated at a Schottky field emitter [4]. We find strong Coulomb-correlations and field-controllable antibunching in electron pair, triple, and quadruple states, with a characteristic energy scale of 2 eV. State-sorted beam caustics show a discrete increase in virtual source size and longitudinal source shift.
Inducing such few-electron Coulomb correlations facilitates non-Poissonian electron pulse statistics and single-electron heralding, and promises 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., Nature Physics 19, 1410-1417 (2023).
Keywords: coherent electron pulses; electron correlations; ultrafast electron micrscopy; beam dynamics; Coulomb effects