Measurements of the quantum anomalous Hall effect in a magnetically doped topological insulator to an accuracy of a few parts in 109 at zero magnetic field show that the system could provide a new type of quantum standard of resistance.
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Callegaro, L. A quantum standard of resistance without a magnetic field. Nat Electron 7, 1074–1075 (2024). https://doi.org/10.1038/s41928-024-01305-x
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DOI: https://doi.org/10.1038/s41928-024-01305-x
