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. 2020 Sep 29;10:15950. doi: 10.1038/s41598-020-72746-5

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© The Author(s) 2020

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Asymmetric versus Symmetric current flow. Calculated harmonic powers under asymmetric (a, b) versus symmetric (c, d) current flow for the fourth (a, c) and sixth (b, d) harmonics with an input field oscillating at $ν$ =120 GHz. The input has been calibrated by simulated annealing as explained in the “Methods” section. In each panel the color bar is normalized to the maximum power output within the voltage range (0, 10) mV. The goal here is to show the clear that there is no emission around zero voltage for symmetric current flow in contrast with the asymmetric flow case.