Modelling high-harmonic generation in solids beyond the single active electron

Laser-driven electrons in linear chains of ions constitute the simplest models for the study of high-harmonic generation (HHG) in solids. The importance of band structure, finite-size or surface effects, and electron-electron interaction can be systematically investigated using such models. On the poster, we illustrate our implementation of a time-dependent Kohn-Sham solver for the study of solid slabs in intense laser fields. In particular, we present HHG spectra, discuss their cut-offs, and analyze the role of electron-electron interaction and topological surface effects [1,2]. \\ \mbox{\qquad}\\ \noindent {[1]} Kenneth K. Hansen, Tobias Deffge, Dieter Bauer, "High-order harmonic generation in solid slabs beyond the single-active-electron approximation", Phys. Rev. A 96, 053418 (2017).\\ {[2]} Dieter Bauer, Kenneth K. Hansen, "High-harmonic generation in solids with and without topological edge states", (submitted) arXiv:1711.05783.