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A: Fachverband Atomphysik
A 15: Poster I
A 15.29: Poster
Dienstag, 12. März 2024, 17:00–19:00, Tent A
Acceleration-enhanced Coulomb correlations between free electrons in a transmission electron microscope beam — •Lisa Beimel1,2, Rudolf Haindl1,2, Sergey V. Yalunin1,2, Armin Feist1,2, and Claus Ropers1,2 — 1Department of Ultrafast Dynamics, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany — 24th Physical Institute, University of Göttingen, Göttingen, Germany
Correlated electrons are at the heart of many phenomena in condensed matter, as well as atomic and molecular physics. Generally, highly correlated free-electron states are of interest both from a fundamental perspective and for their potential in manifold electron beam applications.
For the generation of free electrons, we employ femtosecond-triggered photoemission from a nanoscale Schottky field emitter in an ultrafast transmission electron microscope [1]. When n electrons are generated by the same laser pulse at the emitter, their initially weak inter-particle Coulomb repulsion is acceleration-enhanced to a strong energy exchange of about 2 eV, as confirmed by trajectory simulations. In our experiment, we measure distinct energy correlations in transverse and longitudinal direction of pair, triple and quadruple free-electron states [2].
In this contribution, we will present recent results on the study of free-electron correlations in an electron microscope beam.
[1] A. Feist et al., Ultramicroscopy 176, 63-73 (2017).
[2] R. Haindl et al., Nat. Phys. 19, 1410-1417 (2023).
Keywords: correlated electrons; ultrafast transmission electron microscopy; electron emitters; photoemission; Coulomb interaction