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O: Fachverband Oberflächenphysik

O 14: Plasmonics and Nanooptics II: Light-Matter Interaction and Spectroscopy

O 14.1: Talk

Monday, March 18, 2024, 15:00–15:15, MA 042

Towards Isolated Attosecond Electron Trios — Germann Hergert, •Rasmus Lampe, Andreas Wöste, and Christoph Lienau — Institut für Physik, Carl-von-Ossietzky Universität, 26129 Oldenburg, Germany

Very recently, the formation of multi-electron number states in the laser-triggered photoemission from metal tips has created much attention [1,2]. These number-states show intriguing properties, like highly correlated electron energies and increasing nonlinearities in their power scaling. Here, we use, for the first time, few-cycle near-infrared driving pulse around 2000 nm for the creation of such number states. The low photon energy, 1/7 of the work function of gold, drastically increases the nonlinear order of the emission process, up to the 21st order for multiphoton-emission of a three-electron state.

Such extreme nonlinearities make the emission process exceptionally sensitive to minor changes in the driving field. We demonstrate this by monitoring the electron yield while varying the delay of a phase-locked pulse pair. We observe autocorrelations that are fully governed by an isolated central peak with 0.8 fs width. Only two side peaks with amplitudes < 25% are seen. This may enable the generation of isolated attosecond electron trios. We are currently studying the CEP dependence of the emission to gain further insight into the emission regime.

[1] S. Meier et al., Nat. Phys. 19, 1402 (2023)

[2] R. Haindl et al., Nat. Phys. 19, 1410 (2023)

Keywords: Electron point source; Attosecond electron pulses; Nonlinear photoemission; Electron number states