SAMOP 2023 – scientific programme

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A: Fachverband Atomphysik

A 3: Interaction with Strong or Short Laser Pulses I (joint session A/MO)

A 3.6: Talk

Monday, March 6, 2023, 12:30–12:45, F303

Ultrafast two-electron correlations from metal needle tips — •Jonas Heimerl, Stefan Meier, and Peter Hommelhoff — Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91058 Erlangen

When two electrons are emitted in a very confined space-time volume on the nanometer-femtosecond scale, strong Coulomb interaction is present. With the advent of multi-hit capable electron detectors, the field of ultrafast light matter interaction around metal needle tips is venturing into correlated multi-electron dynamics. Here we show the Coulomb-induced energy anti-correlation of two electrons emitted from nanometer-sized tungsten needle tips triggered by femtosecond laser pulses [1]. We extract two important key parameters: (1) the mean energy splitting of 3.3 eV and (2) the correlation decay time of 82 fs. Both parameters are essential for modern ultrafast electron microscopes, as shown in similar work from the Göttingen group [2]. We demonstrate that by filtering the electrons energetically, clear sub-Poissonian distributed electron beams can be achieved, highly relevant for beating the shot-noise limit in imaging applications. Furthermore, we show that in the strong field regime, where ponderomotive effects of the laser field become important, the anti-correlation gap is strongly influenced.

[1] S. Meier, J. Heimerl and P. Hommelhoff, arXiv:2209.11806 (2022)

[2] R. Haindl et al., arXiv:2209.12300 (2022)