Hannover 2020 – scientific programme

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A: Fachverband Atomphysik

A 19: Interaction with strong or short laser pulses II

A 19.4: Talk

Wednesday, March 11, 2020, 15:00–15:15, f107

High-harmonic generation in topological graphene-like nanoribbons — •Christoph Jürß and Dieter Bauer — University of Rostock, Germany

The interaction of intense laser-pulses with graphene-like nanoribbons is investigated. The system becomes topological if a (sufficiently large) complex next-nearest neighbor hopping is included. In the topological phase, the ribbon can host edge states, which have no influence on the bulk of the system. The differences between the high-harmonic spectra from finite ribbons and the bulk are studied. These differences indicate the contributions of the edge states to the spectra. Further, the emitted photons show a change in the helicity at a certain energy which depends on the strength of the next-nearest neighbor hopping. This could allow a light source with a controlled helicity of the emitted radiation.