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A: Fachverband Atomphysik
A 21: Interaction with Strong or Short Laser Pulses II (joint session A/MO)
A 21.7: Talk
Wednesday, March 13, 2024, 16:00–16:15, HS 1010
Tracing attosecond electron emission from a nanometric metal tip — •Lennart Seiffert1, Philip Dienstbier2, Timo Paschen2, Andreas Liehl3, Alfred Leitenstorfer3, Thomas Fennel1,4, and Peter Hommelhoff2 — 1University of Rostock — 2University of Konstanz — 3Friedrich-Alexander-Universität Erlangen-Nürnberg — 4Max Born Institute Berlin
Solids exposed to intense electric fields release electrons through tunnelling. This fundamental quantum process lies at the heart of various applications such as petahertz vacuum electronics where electron wavepackets undergoe semiclassical dynamics in an intense laser field, similar to strong-field physics in the gas phase. Recently, we measured the subcycle-dynamics at solids, inclunding the duration of the emission time window [1] and the temporal width of the recolliding wavepacket [2]. Here I present how the suboptical-cycle strong-field emission dynamics from a metallic nanotip is uncovered via two-colour modulation spectroscopy [1,3], where energy spectra of emitted photoelectrons are measured as function of the relative phase between the colors. Projecting the solution of the time-dependent Schrödinger equation onto classical trajectories relates phase-dependent signatures in the spectra to the emission dynamics and yields an emission duration of 710±30 attoseconds.
[1] P. Dienstbier et al., Nature 616, 702-706 (2023)
[2] H. Y. Kim et al., Nature 613, 662-666 (2023)
[3] L. Seiffert et al., J. Phys. B 51, 134001 (2018)