Observation of vortex-string chiral modes in metamaterials

Jingwen Ma, Ding Jia, Li Zhang, Yi-jun Guan, Yong Ge, Hong-xiang Sun (), Shou-qi Yuan, Hongsheng Chen, Yihao Yang () and Xiang Zhang ()
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Jingwen Ma: The University of Hong Kong
Ding Jia: Zhejiang University
Li Zhang: Zhejiang University
Yi-jun Guan: Jiangsu University
Yong Ge: Jiangsu University
Hong-xiang Sun: Jiangsu University
Shou-qi Yuan: Jiangsu University
Hongsheng Chen: Zhejiang University
Yihao Yang: Zhejiang University
Xiang Zhang: The University of Hong Kong

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract As hypothetical topological defects in the geometry of spacetime, vortex strings could have played many roles in cosmology, and their distinct features can provide observable clues about the early universe’s evolution. A key feature of vortex strings is that they can interact with Weyl fermionic modes and support massless chiral-anomaly states along strings. To date, despite many attempts to detect vortex strings in astrophysics or to emulate them in artificially created systems, observation of these vortex-string chiral modes remains experimentally elusive. Here we report experimental observations of vortex-string chiral modes using a metamaterial system. This is implemented by inhomogeneous perturbation of Yang-monopole phononic metamaterials. The measured linear dispersion and modal profiles confirm the existence of topological modes bound to and propagating along the string with the chiral anomaly. Our work provides a platform for studying diverse cosmic topological defects in astrophysics and offers applications as topological fibres in communication techniques.

Date: 2024
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DOI: 10.1038/s41467-024-46641-w

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