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MO: Fachverband Molekülphysik

MO 19: Interaction with Strong or Short Laser Pulses I (joint session A/MO)

MO 19.4: Vortrag

Mittwoch, 12. März 2025, 15:30–15:45, GrHS Mathe

Harmonic generation with topological edge states and electron-electron interaction — •Siamak Pooyan and Dieter Bauer — Institute of Physics, Rostock University, 18051 Rostock, Germany

It has been found previously that the presence or absence of topological edge states in the Su-Schrieffer-Heeger (SSH) model has a huge impact on harmonic generation spectra. More specifically, the yield of harmonics for harmonic orders that correspond to photon energies below the band gap is many orders of magnitude different in the trivial and topological phase. It is shown in this work that this effect is still present if electron-electron interaction is taken into account, i.e., if a Hubbard term is added to the SSH Hamiltonian. To that end, finite SSH-Hubbard chains at half filling are considered that are short enough to be accessible to exact diagonalization but already showing edge states in the topological phase. We show that the huge difference in the harmonic yield between the trivial and the topological phase can be reproduced with few-level models employing only the many-body ground state and a few excited many-body states.

Keywords: High-order harmonic generation; Su-Schrieffer-Heeger-Hubbard chain; Topological insulators; Edge states; Topological materials