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. 2019 Jan 21;10:349. doi: 10.1038/s41467-018-08215-5

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© The Author(s) 2019

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 http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — Edge modes of the topological cavity. Each panel shows a density plot of a time snapshot of the magnetic field in a cylindrical cavity ( $R = 10 c ∕ ω_{p}$ ) for (a) the mode l = 8 in the 1st (low-frequency) gap (propagating in the anti-clockwise direction) and (b) the mode l = −5 in the 2nd (high-frequency) gap (propagating in the clockwise direction). The arrows represent the electric field lines