Berlin 2024 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 30: Ultrafast Phenomena II

HL 30.6: Talk

Wednesday, March 20, 2024, 11:30–11:45, EW 015

Modelling dephasing effects in High Harmonic Generation in a real space Tight-Binding-approach — •Martin Thümmler¹, Alexander Croy¹, Ulf Peschel², and Stefanie Gräfe¹ — ¹Institute of Physical Chemistry, University of Jena — ²Institute of Condensed Matter Theory and Optics, University of Jena

High harmonic generation in bulk materials is commonly described by semiconductor Bloch equations employing ultrashort dephasing times (∼ 2 fs). Those are chosen to match the clear harmonic peaks observed in experiments, but contradict spectroscopic measurements of narrow linewidth excitonic peaks in semiconductors. Therefore the physical origin of these short dephasing times is currently strongly debated.

In this talk, we focus on real space dephasing models starting from our periodic real space Tight-Binding model. Extending this model, we discuss the effect of different real space dephasing mechanisms on the calculated high harmonic spectra.

Keywords: HHG; Dephasing