Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 20: Attosecond Science III
A 20.3: Vortrag
Dienstag, 6. März 2018, 15:00–15:15, K 1.011
Topological effects in high-harmonic generation by linear chains — •Helena Drüeke1, Kenneth Hansen2, and Dieter Bauer1 — 1Institute of Physics, University of Rostock, 18051 Rostock, Germany — 2Department of Physics and Astronomy, Aarhus University, DK-8000, Denmark
High-harmonic generation (HHG) in the two topological phases of a finite, one-dimensional, periodic structure is investigated using a self-consistent time-dependent density functional theory (TDDFT) approach [1,2]. For harmonic photon energies smaller than the band gap, the harmonic yield is found to differ up to fourteen orders of magnitude for the two topological phases. This giant topological effect is explained by the degree of destructive interference in the harmonic emission of all valence-band electrons, which strongly depends on whether topological edge states are present or not.
[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.