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Title: Observation of a topological nodal surface and its surface-state arcs in an artificial acoustic crystal
Authors: Yang, Yihao
Xia, Jian-Ping
Sun, Hong-Xiang
Ge, Yong
Jia, Ding
Yuan, Shou-Qi
Yang, Shengyuan A.
Chong, Yidong
Zhang, Baile
Keywords: Science::Physics
Issue Date: 2019
Source: Yang, Y., Xia, J.-P., Sun, H.-X., Ge, Y., Jia, D., Yuan, S.-Q., . . . Zhang, B. (2019). Observation of a topological nodal surface and its surface-state arcs in an artificial acoustic crystal. Nature communications, 10, 5185-. doi:10.1038/s41467-019-13258-3
Journal: Nature Communications
Abstract: Three-dimensional (3D) gapless topological phases can be classified by the dimensionality of the band degeneracies, including zero-dimensional (0D) nodal points, one-dimensional (1D) nodal lines, and two-dimensional (2D) nodal surfaces. Both nodal points and nodal lines have been realized recently in photonics and acoustics. However, a nodal surface has never been observed in any classical-wave system. Here, we report on the experimental observation of a twofold symmetry-enforced nodal surface in a 3D chiral acoustic crystal. In particular, the demonstrated nodal surface carries a topological charge of 2, constituting the first realization of a higher-dimensional topologically-charged band degeneracy. Using direct acoustic field measurements, we observe the projected nodal surface and its Fermi-arc-like surface states and demonstrate topologically-induced robustness of the surface states against disorders. This discovery of a higher-dimensional topologically-charged band degeneracy paves the way toward further explorations of the physics and applications of new topological semimetal phases.
ISSN: 2041-1723
DOI: 10.1038/s41467-019-13258-3
DOI (Related Dataset): 10.21979/N9/OGJJUS
Schools: School of Physical and Mathematical Sciences 
Organisations: Centre for Disruptive Photonic Technologies
The Photonics Institute
Rights: © 2019 The Author(s) (Nature Publishing Group) (Open Access). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit
Fulltext Permission: open
Fulltext Availability: With Fulltext
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