Hannover 2020 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 14: Poster Session - Atomic Physics II

A 14.6: Poster

Dienstag, 10. März 2020, 16:00–18:00, Empore Lichthof

Simulation of high-order harmonic generation in ZnO — •Christian Hünecke, Ivan Gonoskov, Martin Richter, and Stefanie Gräfe — Institute for Physical Chemistry, Friedrich-Schiller University Jena, Germany

Pump-probe experiments shed some light on the involvement of optical phonons in the generation of high-harmonic radiation in zinc oxide [1]. Two approaches for the theoretical description of the HHG spectra are employed. At first the time-dependent Schroedinger equation is solved numerically using a Coulomb-type potential with periodic boundary conditions. The calculated harmonic spectra are compared with the results based on the real-time real-space time-dependent density functional theory (TDDFT) obtained using the software-package "Octopus" [2]. In the TDDFT scheme the influence of a phonon is analyzed by parametrically shifting the position of the nuclei in the lattice structure of ZnO.

[1]: R. Hollinger, V. Shumakova, A. Pugžlys, S. Khujanov, A. Baltuška, C. Spielmann, D. Kartashov, "High-order harmonic generation traces ultrafast coherent phonon dynamics in ZnO", Ultrafast Phenomena 2018, to be published in Eur. Phys. J. - Web of Conferences

[2]: Xavier Andrade et al., "Real-space grids and the Octopus code as tools for the development of new simulation approaches for electronic systems", Physical Chemistry Chemical Physics 17, 31371-31396 (2015)