Freiburg 2024 – scientific programme

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A: Fachverband Atomphysik

A 25: Poster IV

A 25.14: Poster

Wednesday, March 13, 2024, 17:00–19:00, Tent A

The attoclock and its interpretation, real-valued tunneling time and superluminal tunneling — •Ossama Kullie — 1 Theoretical Physics, Institute of Physics, University of Kassel

Tunneling is a quantum mechanical phenomena. The time required for the tunneling or field-ionization of an electron from an atom through a laser field can be measured using the so-called attoclock. However, some authors claim that the time delay measured by the attoclock is not an indicator of the tunneling time. We present a model that describes the tunnel- or field-ionization of the attoclock experiment for He- [1] and H-atom [2], in the adiabatic and nonadiabatic field calibrations [3]. And we show that one can interpret the attoclock measurement in such a way that it is possible to determine the tunneling time or the time delay due the barrier region or the classically forbidden region. We also show that for the weak measurement [4], in which the time is usually measured by the Larmor clock [5], the attoclock offers a possibility to measure the interaction time for thick barrier and even superluminal tunneling is possible [6].

[1] A. S. Landsman et al, Optica 1, 343 (2014), U. S. Sainadh et al, Nature 586, 75 (2019). [2] C. Hofmann et al. J. Mod. Opt. 66, 1052 (2019). [3] O. Kullie, Phys. Rev. A 92, 052118 (2015), O. Kullie and I. A. Ivanov, arXiv:2005.09938v6. [4] Y. Aharonov, Phys. Rev. A. 65, 052124 (2002). [5] R. Ramos, Nat. 538, 529 (2020). [6] Work in preparation.

Keywords: Ultrafast science and strong field interaction; Attosecond physics; Time-delay and time-energy uncertainty relation; Weak measurement and nonadiabatic effect; time and time-operator in quantum mechanics