Hannover 2020 – scientific programme

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A: Fachverband Atomphysik

A 9: Poster Session - Atomic Physics I

A 9.21: Poster

Monday, March 9, 2020, 16:00–18:00, Empore Lichthof

Measuring the Zak phase of the SSH chain by HHG — •Daniel Moos, Christoph Jürß, and Dieter Bauer — University of Rostock, Rostock, Germany

In recent work [1,2], a many-order-of-magnitude enhancement in the high-harmonic generation (HHG) efficiency has been shown between different topological phases of a 1D chain with a time-dependent density functional theory calculation. Shortly thereafter [3] the same effect was observed using a much simpler model and the tight-binding approximation. The discovery that the simplest model known to exhibit topological effects, the Su-Schrieffer-Heeger (SSH) model, shows this feature raises the question which other effects this model might also contain. In this work we measure the Berry phase of the SSH model using the expression given by Zak, thereby showing that topological phases may be distinguished by all-optical means.

[1] Dieter Bauer, Kenneth K. Hansen, Phys. Rev. Lett. 120, 177401 (2018).

[2] Helena Drüeke, Dieter Bauer, Phys. Rev. A 99, 053402 (2019).

[3] Christoph Jürß, Dieter Bauer, Phys. Rev. B 99, 195428 (2019).