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Observation of chiral zero mode in inhomogeneous three-dimensional Weyl metamaterials

TitleObservation of chiral zero mode in inhomogeneous three-dimensional Weyl metamaterials
Publication TypeJournal Article
Year of Publication2019
AuthorsH. Jia, R. Zhang, W. Gao, Q. Guo, B. Yang, J. Hu, Y. Bi, Y. Xiang, C. Liu, and S. Zhang
JournalScience
Volume363
Pagination148-151
Date PublishedJAN 11
Type of ArticleArticle
ISSN0036-8075
Abstract

Owing to the chirality of Weyl nodes, the Weyl systems can support one-way chiral zero modes under a strong magnetic field, which leads to nonconservation of chiral currents-the so-called chiral anomaly. Although promising for robust transport of optical information, the zero chiral bulk modes have not been observed in photonics. Here we design an inhomogeneous Weyl metamaterial in which a gauge field is generated for the Weyl nodes by engineering the individual unit cells. We experimentally confirm the presence of the gauge field and observe the zero-order chiral Landau level with one-way propagation. Without breaking the time-reversal symmetry, our system provides a route for designing an artificial magnetic field in three-dimensional photonic Weyl systems and may have potential for device applications in photonics.

DOI10.1126/science.aau7707