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O: Fachverband Oberflächenphysik
O 79: Plasmonics and nanooptics: Light-matter interaction, spectroscopy III
O 79.5: Vortrag
Donnerstag, 12. März 2026, 11:30–11:45, HSZ/0403
Tunable skyrmion, meron, and skyrmion bag topologies in surface phonon polariton lattices — •Julian Schwab1, Florian Mangold1, Bettina Frank1, Timothy J. Davis1,2, and Harald Giessen1 — 14th Physics Institute, Research Center SCoPE, and Integrated Quantum Science and Technology Center, University of Stuttgart, Germany — 2School of Physics, University of Melbourne; Parkville Victoria 3010, Australia
Surface phonon polaritons (SPhPs) enable nanoscale manipulation of mid-infrared light via deeply subwavelength topological vector textures, such as skyrmions. Achieving dynamic, real-time control over these topological features remains challenging. Here, we theoretically propose and numerically demonstrate an actively tunable platform on a silicon carbide membrane that creates diverse topological lattices, including skyrmions, merons, and skyrmion bags. By exploiting the sublinear SPhP dispersion, we dynamically adjust the excitation wavelength to tune the topological character of the lattices. This allows for the tunability between bubble-type and Néel-type configurations in the electric field and the spin angular momentum. Furthermore, we identify a novel singularity-type meron arising from the interplay of electric and magnetic spin components. This texture exhibits topological charge conservation in moiré superlattices and a spatially confined spin reversal with tunable lateral sizes as low as λSPhP/29. These findings provide a versatile framework for on-chip, reconfigurable topological photonic devices with potential applications in high-resolution imaging and precision metrology.
Keywords: Surface Phonon Polaritons; Topology; Nanophotonics; Skyrmion; Meron