Observation of higher-order time-dislocation topological modes

Jia-Hui Zhang, Feng Mei (), Yi Li, Ching Hua Lee (), Jie Ma, Liantuan Xiao and Suotang Jia
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Jia-Hui Zhang: Shanxi University
Feng Mei: Shanxi University
Yi Li: Shanxi University
Ching Hua Lee: National University of Singapore
Jie Ma: Shanxi University
Liantuan Xiao: Shanxi University
Suotang Jia: Shanxi University

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: Abstract Topological dislocation modes resulting from the interplay between spatial dislocations and momentum-space topology have recently attracted significant interest. Here, we theoretically and experimentally demonstrate time-dislocation topological modes which are induced by the interplay between temporal dislocations and Floquet-band topology. By utilizing an extra physical dimension to represent the frequency-space lattice, we implement a two-dimensional Floquet higher-order topological phase and observe time-dislocation induced π-mode topological corner modes in a three-dimensional circuit metamaterial. Intriguingly, the realized time-dislocation topological modes exhibit spatial localization at the temporal dislocation, despite homogeneous in-plane lattice couplings across it. Our study opens a new avenue to explore the topological phenomena enabled by the interplay between real-space, time-space and momentum-space topology.

Date: 2025
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DOI: 10.1038/s41467-025-56717-w

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