Hannover 2013 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 39: Poster: Atomic systems in external fields

A 39.2: Poster

Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof

Laser-induced tunneling in the relativistic regime — •Enderalp Yakaboylu, Michael Klaiber, Heiko Bauke, Karen Z. Hatsagortsyan, and Christoph H. Keitel — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany

A novel physical picture of laser driven tunneling at ions in the relativistic regime is presented. In the quasi-static approximation of the process, it can be shown that the tunneling barrier is identical to the one in the non-relativistic case via the dipole-approximation and that only the energy level on which the electron tunnels through the barrier is altered by the magnetic field component. This leads to a shift of the momentum distribution of the ionized electron with a maximum at a value that compensates the action of the laser magnetic field during tunneling. Further, the total tunneling rate is increased compared to the non-relativistic case by the relativistic mass correction, that changes the energy-momentum dispersion relation. Other relativistic correction terms are playing no role. Finally, it is shown that the electron experiences no drift in laser propagation direction under the barrier in the quasi-classical approximation, i.e., solely moves along the laser polarization direction [1].

[1] Michael Klaiber, Enderalp Yakaboylu, Heiko Bauke, Karen Z. Hatsagortsyan, and Christoph H. Keitel, preprint arXiv:1205.2004