Hannover 2020 – scientific programme

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A: Fachverband Atomphysik

A 19: Interaction with strong or short laser pulses II

A 19.7: Talk

Wednesday, March 11, 2020, 15:45–16:00, f107

Under-the-barrier reflections and and time delay in strong field ionization. — •Daniel Bakucz Canário, Michael Klaiber, Karen Z. Hatsagortsyan, and Christoph H. Keitel — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

We identify the time delay of an ionizing electron wave packet (with respect to the laser peak) in strong field ionization as a phenomenon induced by re-scatterings and interferences of the wavefunction under the Coulomb barrier, corroborating earlier findings relating under-the barrier-scattering to shifts in the momentum probability distribution[1]. We achieve this by separating incoming and outgoing components of the electronic wave function under the barrier, and observing the effect of manually removing the reflected wavefunction components. A simple 1D model of ionization within strong field approximation is considered but the conceptual framework is general. Finally, we compare the calculated electron trajectory after ionization with equivalent adiabatic and classical trajectories and find that, in the regime of small Keldysh parameters, the three trajectories rapidly become indistinguishable, potentially posing challenges for the oft used back propagation method.
[1] M. Klaiber et al, Phys. Rev. Lett. 120, 013201 (2018)