Berlin 2014 – scientific programme
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A: Fachverband Atomphysik
A 41: Interaction with VUV and X-ray light II
A 41.1: Invited Talk
Thursday, March 20, 2014, 14:00–14:30, BEBEL E42
Quantum systems in ultra-strong lasers: from tunnel ionization to spin dynamics — •Heiko Bauke1, Sven Ahrens1, Michael Klaiber1, Enderalp Yakaboylu1, Karen Z. Hatsagortsyan1, Carsten Müller1,2, and Christoph H. Keitel1 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg — 2Institut für Theoretische Physik I, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße 1, 40225 Düsseldorf
We extend the well-known tunneling picture of a scalar tunneling barrier into the relativistic domain, that is where the laser’s magnetic field becomes non-negligible and, therefore, requiring a non-zero vector potential. Going beyond the quasistatic WKB approximation and employing numerical methods allows us to identify two time scales of relativistic tunneling, the typical time that characterizes the probability density’s decay of the ionizing electron under the barrier (Keldysh time) and the time interval which the electron spends inside the barrier (Eisenbud-Wigner-Smith tunneling time) [1]. Finally, we will consider spin effects in tunnel ionization [2] and demonstrate distinct spin dynamics in the relativistic Kapitza-Dirac effect [3] and for electrons moving in strong circularly polarized laser fields.
- =4pt =-2pt [1]
- Phys. Rev. Lett., 110, 153004 (2013); E. Yakaboylu et al., arXiv:1309.0610; Proc. of SPIE, 8780, 87801Q (2013)
- [2]
- M. Klaiber et al., arXiv:1305.5379
- [3]
- Phys. Rev. Lett. 109, 043601 (2012); Phys. Rev. A, 88, 012115 (2013).