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. 2020 Nov 6;11:5634. doi: 10.1038/s41467-020-19459-5

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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 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. 4 — a, Schematic structure of the NbSe₂ antenna device for the measurement of DC signal. The nanovoltage meter was directly connected to NbSe₂. Sine wave AC signals were applied to the fabricated resistor. b, Optical image of the antenna device, scale bar, 20 μm. The NbSe₂ thickness is three layers. c, R^2ω-T of the device under negative and positive applied magnetic fields perpendicular to the substrate (with no AC signal applied on the resistor). d, V_DC-B of the device with sine wave AC signal (V_P-P = 200 mV, f_IN = 5.52 MHz) applied on the resistor. e, R^2ω-B curves of the device with the temperature changing from 2 to 6.75 K. Inset, the first harmonic signal of the device measured simultaneously with the second harmonic signal. Both the first and second harmonic signals were measured under no AC signal applied to the resistor. f, DC signal V_DC-B of the device with the temperature changing from 2 to 6.75 K with sine wave AC signal (V_P-P = 200 mV, f_IN = 5.52 MHz) applied to the resistor, showing similar antisymmetric behavior to the R^2ω-B curves. Inset, DC signal of the device at T = 2 K with no AC signal applied to the resistor. The antisymmetric signal comes from environmental fluctuations.