2025年4月22日，德国斯图加特大学Giessen, Harald课题组在《自然—物理学》杂志发表论文，他们研究了等离子体云纹超晶格中的Skyrmion光袋。

对具有层间扭曲的范德华异质结构的研究，称为扭曲谱，有助于推进对许多强相关相的理解，其中许多相来自物理系统的拓扑结构。研究组通过使用具有相对扭曲的两个叠加的等离子体skyrmion晶格创建莫尔skyrmion超晶格，探索了扭宇宙论范式在具有非平凡拓扑的等离子体系统中的应用。

他们使用时间分辨偏振光电子能显微镜测量了云纹超晶格的复电场分布。研究结果结果表明，每个超晶胞都有非常大的拓扑不变量，并包含一个skyrmion袋，其大小可以通过扭曲角度和旋转中心来控制。该工作表明了扭曲谱如何能够在光场中创建各种拓扑特征，并为局部操纵电磁场分布提供了一条途径。

附：英文原文

Title: Skyrmion bags of light in plasmonic moiré superlattices

Author: Schwab, Julian, Neuhaus, Alexander, Dreher, Pascal, Tsesses, Shai, Cohen, Kobi, Mangold, Florian, Mantha, Anant, Frank, Bettina, Bartal, Guy, Meyer zu Heringdorf, Frank-J., Davis, Timothy J., Giessen, Harald

Issue&Volume: 2025-04-22

Abstract: The study of van der Waals heterostructures with an interlayer twist, known as twistronics, has been instrumental in advancing the understanding of many strongly correlated phases, many of which derive from the topology of the physical system. Here we explore the application of the twistronics paradigm in plasmonic systems with a non-trivial topology by creating a moiré skyrmion superlattice using two superimposed plasmonic skyrmion lattices with a relative twist. We measure the complex electric field distribution of the moiré skyrmion superlattice using time-resolved polarimetric photoemission electron microscopy. Our results show that each supercell has very large topological invariants and harbours a skyrmion bag, the size of which is controllable by the twist angle and centre of rotation. Our work indicates how twistronics can enable the creation of various topological features in optical fields and provides a route for locally manipulating electromagnetic field distributions.

DOI: 10.1038/s41567-025-02873-1

Source: https://www.nature.com/articles/s41567-025-02873-1