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A: Fachverband Atomphysik

A 24: Attosecond physics

A 24.4: Vortrag

Mittwoch, 25. März 2015, 15:15–15:30, C/kHS

Signatures of nonadiabatic, relativistic effects and tunneling time delay in the photoelectron momentum distributionof tunnel-ionization — •Enderalp Yakaboylu, Michael Klaiber, Karen Z. Hatsagortsyan, and Christoph H. Keitel — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg,Germany

We investigate the influence of the nonadiabatic and relativistic effects on the photoelectron momentum distribution in tunnel-ionization using relativistic strong field approximation. The asymptotic momentum distribution for the maximal tunneling probability in a laser field of elliptical polarization is derived. It is shown that the momentum distribution is shifted with respect to the nonrelativistic case along the laser propagation direction due to the relativistic effect, and the radius of the momentum distribution ellipse is increased due to the nonadiabatic effect. The modifications of the asymptotic momentum distribution arise due to the under-the-barrier dynamics [1,2]. Finally, we discuss the effect of tunneling time delay [2,3]. We define a quantum mechanical trajectory and map the time delay between the quasiclassical trajectory and a quantum mechanical one to a longitudinal momentum shift at the tunnel exit.

[1] M. Klaiber, E. Yakaboylu, H. Bauke, K. Z. Hatsagortsyan, and C. H. Keitel, Phys. Rev. Lett. 110, 153004 (2013). [2] E. Yakaboylu, M. Klaiber, H. Bauke, K. Z. Hatsagortsyan, and C. H. Keitel, Phys. Rev. A 88, 063421 (2013). [3] E. Yakaboylu, M. Klaiber, and K. Z. Hatsagortsyan, Phys. Rev. A 88, 063421 (2014).