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. 2018 May 21;4:7. doi: 10.1038/s41378-018-0008-3

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© The Author(s) 2018

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. 1 — a Sketch of the GCG nanowire. The nanowire described in a cylindrical coordinate system is shown in the top inset and its cross-section is shown in the bottom one. Switching “on” (top panel) and “off” (bottom panel) b non-chiral SPP modes at E_F = 0.46 eV and c chiral SPP modes at E_F = 0.6 eV by changing the GST phase from amorphous to crystalline. Fig. 1b,c share the same color bar. d Comparison of β₂ for the EH_±1 and TM SPP modes in the GCG nanowire with the crystalline GST core