Dresden 2026 – scientific programme
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O: Fachverband Oberflächenphysik
O 49: Plasmonics and nanooptics: Light-matter interaction, spectroscopy I
O 49.3: Talk
Tuesday, March 10, 2026, 15:00–15:15, HSZ/0403
Femtosecond and attosecond correlations in multi-electron pulses — •Rudolf Haindl1,2, Valerio Di Giulio1,2, Armin Feist1,2, and Claus Ropers1,2 — 1Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany — 24th Physical Institute, University of Göttingen, Göttingen, Germany
In femtosecond electron emission from nanoscale field emitters, Coulomb interactions result in structured few-electron states exhibiting strong correlations in energy [1,2], transverse momentum [1], and time [3]. Here, we combine femtosecond-gated, event-based detection with inelastic electron-light scattering to directly map the phase-space distribution of two-electron states [4].
Our experiments reveal a bimodal structure in longitudinal phase space, distinguishing contributions from interparticle interaction and dispersion. Furthermore, we demonstrate that global phase modulation coherently shapes the few-electron distribution to exhibit attosecond temporal correlations. We show how this controlled phasing drives a multi-electron quantum walk, a phenomenon that can be harnessed to produce tailored excitations and super-radiance via two-electron energy post-selection.
[1] R. Haindl et al., Nat. Phys. 19, 1410-1417 (2023).
[2] S. Meier et al., Nat. Phys. 19, 1402-1409 (2023).
[3] J. Kuttruff et al., Sci. Adv. 10, eadl6543 (2024).
[4] R. Haindl et al., Phys. Rev. Lett. 135, 165002 (2025).
Keywords: Quantum electron-light interaction; Two-particle quantum walk; Correlated electrons; Coulomb interactions; Ultrafast electron microscopy