Freiburg 2024 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 21: Interaction with Strong or Short Laser Pulses II (joint session A/MO)
A 21.3: Vortrag
Mittwoch, 13. März 2024, 15:00–15:15, HS 1010
Coulomb-correlated multi-electron states generated by femtosecond laser-triggered nanotip photoemission — •Rudolf Haindl1,2, Armin Feist1,2, Till Domröse1,2, Marcel Möller1,2, John H. Gaida1,2, Sergey V. Yalunin1,2, and Claus Ropers1,2 — 1Department of Ultrafast Dyamics, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany — 24th Physical Institute, University of Göttingen, Göttingen, Germany
Correlations between electrons are at the core of numerous phenomena in atomic, molecular, and solid-state systems. For free particles, detecting inter-particle correlations remains challenging, as ensemble-averaged detection typically conceals few-body effects.
A powerful approach to induce strong electron-electron correlations is spatio-temporally confined photoemission from field emitters employed in ultrafast electron microscopes. When n electrons are generated by the same laser pulse at the emitter, their initially meV-scale inter-particle Coulomb repulsion is acceleration-enhanced in a static electric field to an energy exchange of about 2 eV, as confirmed by trajectory simulations.
In our experiment, we measure distinct energy correlations of pair, triple and quadruple free-electron states in transverse and longitudinal direction [1]. Furthermore, we demonstrate control over the magnitude of Coulomb correlations and discuss how they can facilitate non-Poissonian electron pulse statistics with applications in free-electron quantum optics.
[1] R. Haindl et al., Nat. Phys. 19, 1410-1417 (2023).
Keywords: femtosecond laser pulses; correlated electrons; photoemission; Coulomb interactions; ultrafast transmission electron microscopy