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arXiv · 2411.05576

Observation of Moir\'e Plasmonic Skyrmion Clusters

Lan Zhang·Lipeng Wan·Weimin Deng·Liang Hou·Qiushun Zou·Tongbiao Wang·Daomu Zhao·Tianbao Yu
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Abstract

Skyrmions are topological defects belonging to nontrivial homotopy classes in particle theory. Their remarkably stable topology has recently been observed in electromagnetic waves. For the evanescent fields near a surface, this has been realized so far only for elementary optical skyrmions, with a fixed skyrmion number. Here we report, both in theory and experiment, the concept of moir\'e plasmonic skyrmion clusters, where multi-skyrmions are nested to form a large optical skyrmion cluster. By leveraging twistronics engineering of plasmonic nanostructures, we demonstrate both crystallized and quasi-crystallized optical skyrmion lattices, revealing an unprecedented degree of topological control. In a misaligned composite nanostructure, the rapid inverting of optical skyrmion number is achieved, which is explained by a lattice model. This topological change of moir\'eplasmonic skyrmion clusters can serve as a precise beacon of the relative alignment deviation between composite nanostructures.

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Lan Zhang, Lipeng Wan, Weimin Deng, Liang Hou, Qiushun Zou, Tongbiao Wang, Daomu Zhao, Tianbao Yu. 2024-11-08. Observation of Moir\'e Plasmonic Skyrmion Clusters. https://arxiv.org/abs/2411.05576

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