Rostock 2019 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 25: Attosecond physics

A 25.5: Poster

Mittwoch, 13. März 2019, 16:15–18:15, S Fobau Physik

Modeling time-resolved high-order harmonic generation in ZnO — •Christian Hünecke¹, Thomas Lettau², Ulf Peschel², and Stefanie Gräfe¹ — ¹Institute for Physical Chemistry, Friedrich Schiller University Jena, Germany — ²Institute for Solid State Theory and Optics, Friedrich Schiller University Jena, Germany

Recent pump-probe experiments with mid-infrared excitations in ZnO have provided evidence for a strong modulation of high-order harmonic spectra by optical phonons [1]. Motivated by these experiments, two approaches to theoretically describe such HHG spectra in the condensed phase are employed, which take into account the strong coupling of the phonons to the electronic degrees of freedom. On the one hand, we use a two-dimensional model system consisting of one electronic and one vibrational spatial degree of freedom, similarly to what is typically done in molecular strong-field physics, however with the difference of periodic boundary conditions for the electron. These results are compared with those obtained with a quasi-particle approach based on a numerical solution of the semiconductor Maxwell-Bloch equations, coupled to an optical phonon mode.

[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.