Berlin 2014 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 10: Atomic systems in external fields

A 10.1: Hauptvortrag

Montag, 17. März 2014, 14:00–14:30, BEBEL E44/46

Coulomb effects and correlation in strong laser-driven quantum dynamics — •Dieter Bauer — Institut für Physik, Universität Rostock

The theoretical treatment of atoms or molecules in strong laser fields is mostly based either on the numerical solution of the time-dependent Schrödinger equation (TDSE) or the strong field approximation (SFA).

The full ab initio solution of the TDSE for atoms or molecules in intense, long-wavelength laser fields is limited, in full dimensionality, to, at most, two active electrons. Hence, many-body ab initio approaches beyond linear response are badly needed.

The SFA, when expressed in terms of quantum trajectories, provides maximum insight into laser-driven quantum dynamics, as all features in photoelectron or high harmonics spectra can be interpreted in terms of (interfering) quantum trajectories. However, the Coulomb force on the outgoing electron is neglected in the plain SFA, while there have been several effects identified recently that are due to that Coulomb force, examples being holographic side lobes in photoelectron spectra, the low-energy structure, or rotated photoelectron distributions.

In our presentation we will discuss approaches (i) to incorporate Coulomb corrections into the SFA and (ii) to the simulation of many-electron strong-field quantum dynamics without running into the "exponential wall" of solving the many-body TDSE.