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TUE: Tuesday Contributed Sessions
TUE 9: Quantum Physics in Strong Fields: Contributed Session to Symposium
TUE 9.4: Vortrag
Dienstag, 9. September 2025, 15:00–15:15, ZHG101
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
Correlations between electrons are at the core of numerous phenomena in atomic, molecular, and solid-state physics. In femtosecond electron emission from nanoscale field emitters, Coulomb interactions result in structured few-electron states with strong correlations in energy [1,2], transverse momentum [2], and time[3].
In this contribution [4], we combine femtosecond-gated, event-based detection with inelastic electron-light scattering to directly map the photoelectron phase-space distribution of two-electron states. Our experiments demonstrate a bimodal structure in longitudinal phase space, with distinct contributions from interparticle interaction and dispersion. Moreover, we theoretically reveal that global phase modulation coherently shapes the few-electron phase-space distribution to exhibit attosecond temporal correlations. This controlled phasing of few-electron states leads to a multi-electron quantum walk and 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., arXiv, arXiv:2412.11929 (2024).
Keywords: Correlated electrons; Coulomb interactions; Electron microscopy; Quantum electron-light interaction; Two-particle quantum walk