Erlangen 2018 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 25: Poster Session I

A 25.19: Poster

Dienstag, 6. März 2018, 16:15–18:15, Redoutensaal

The role of laser dressed bands in the strong field dynamics of dielectrics — •Lukas Medišauskas, Ulf Saalmann, and Jan-Michael Rost — Max Planck Institute for the Physics of Complex Systems, Dresden, Germany

Since the discovery of high harmonic generation (HHG) in solid state materials, the dependence of HHG spectra on the generating medium as well as on the chosen geometry and characteristics of the generating radiation were actively investigated.

However, a strong electromagnetic field applied to a material not only drives the electronic dynamics, but also modifies the electronic states via the AC Stark effect, thus modifying the effective band structure.

We investigate such laser “dressing” of the bands of a solid by solving the time-dependent Schrödinger equation for a model dielectric exposed to a strong and low frequency field. Using an expansion into photon-number states, we identify the dominating multi-photon channels and reveal their connection to the field dressed bands. Finally, we demonstrate that the HHG process in solids can be traced to the field dressed band structure.