Bonn 2025 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 21: Poster – Atomic Systems in External Fields
A 21.3: Poster
Mittwoch, 12. März 2025, 17:00–19:00, Tent
Quantum orbit theory applied to HATI spectra from metallic nanotips — •Timo Wirth1, Stefan Meier1, Jonas Heimerl1, and Peter Hommelhoff1,2 — 1Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91058 Erlangen — 2Department Physik, Ludwigs-Maximilians-Universität München (LMU), 80799 München
Quantum orbit theory naturally resembles the three-step model for high order above-threshold ionization (HATI). Unlike its classical realization, quantum orbit theory contains the full quantum mechanical information from the strong-field approximation (SFA) and is therefore suitable to explain electron interference effects. Every contribution in quantum orbit theory is connected to an electron trajectory. The metal boundary condition of the nanotip is accounted for through a selection of quantum orbits while near-field effects are discussed in comparison with TDSE simulations. We apply quantum orbit theory to a HATI measurement of a tungsten nanotip illuminated with laser pulses at a central wavelength of 1550 nm. We find clear signs of intracycle interference. We discuss the spectral positions and the magnitude of these interference signals in terms of quantum orbits.
Keywords: strong-field spectra; high order above-threshold ionization (HATI); nanotip; quantum orbit theory; strong-field approximation (SFA)