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. 2017 Jul 6;8:15995. doi: 10.1038/ncomms15995

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Copyright © 2017, The Author(s)

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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(a) Band structure for a four-band Weyl semimetal with broken inversion symmetry. (b) CPGE trace for same model, for chemical potential shown as a dashed line in a. (c,d) The same for a model of a 3D Rashba material. Both models show a quantized injection current for small frequencies. The dashed vertical line in b corresponds to the frequency above which additional transitions, denoted by a solid vertical line in a, that preclude quantization are allowed.

Inline graphic — (a) Band structure for a four-band Weyl semimetal with broken inversion symmetry. (b) CPGE trace for same model, for chemical potential shown as a dashed line in a. (c,d) The same for a model of a 3D Rashba material. Both models show a quantized injection current for small frequencies. The dashed vertical line in b corresponds to the frequency above which additional transitions, denoted by a solid vertical line in a, that preclude quantization are allowed.