Freiburg 2024 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 2: Attosecond Physics I (joint session A/MO)

MO 2.8: Vortrag

Montag, 11. März 2024, 12:45–13:00, HS 1098

Attoclock, what can or has actually been measured? — •Ossama Kullie — 1 Theoretical Physics, Institute of Physics, University of Kassel

Attoclock is designed to measure the delay time required for a particle to tunnel, or undergo field-ionization, from an atom interacting with a strong laser field. However, some authors claim that the duration the attoclock measures is not a good proxy for tunneling time. In previous works, we showed 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]. In the present talk, we show that it is possible to interpret the attoclock measurement in such a way that real-valued tunnel-time or the delay time due to the barrier region or the classically forbidden region can be determined. Furthermore, we show that in the limit of weak measurement the attoclock provides the interaction time inside the barrier, which is usually measured by the Larmro clock. The limit of thick barrier, the interaction time and the superluminal tunneling are discussed, [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 J. Phys. Commun. 2, 065001 (2018), O. Kullie and I. A. Ivanov, arXiv:2005.09938v6.

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