Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 18: Strong-Field and Ultrafast Phenomena (joint session Q/MO)
Q 18.5: Vortrag
Dienstag, 11. März 2025, 12:15–12:30, HS V
Ultrafast photoemission from gold tips in the intermediate regime — •Leon Brückner1, Jonas Heimerl1, Stefan Meier1, Philip Dienstbier1, Constantin Nauk1,2, and Peter Hommelhoff1,3 — 1Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91058 Erlangen — 2Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany — 3Department Physik, Ludwig-Maximilians-Universität München (LMU), 80799 München
The intermediate regime in photoemission, corresponding to a Keldysh parameter γ around 1-3, lies in between the extreme cases of multiphoton and the quasi-static tunneling emission. This regime shows characteristic features, namely a smooth decrease in the nonlinearity of the emission process as well as the appearance of channel closings. In strong-field experiments at sharp metal needle tips, this picture becomes more complex due to the possible influence of space-charge effects arising from the large number of emitted electrons. We investigate the emitted current from an array of sharp gold tips illuminated with 25 fs laser pulses. Through comparison with time-dependent Schrödinger equation (TDSE) calculations, we identify characteristic intensity-dependent changes in the rate scaling and discuss the influence of space-charge effects.
Keywords: photoemission; ultrafast; strong-field; tips; electrons