Zero-field quantum anomalous Hall metrology as a step towards a universal quantum standard unit system

• Published in: arXiv.org
• Main Authors: Goetz, Martin, Fijalkowski, Kajetan M, Pesel, Eckart, Hartl, Matthias, Schreyeck, Steffen, Winnerlein, Martin, Grauer, Stefan, Scherer, Hansjoerg, Brunner, Karl, Gould, Charles, Ahlers, Franz J, Molenkamp, Laurens W
• Format: Paper Journal Article
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 11.10.2017
• Subjects: Antimony; Bismuth; Ferromagnetism; Josephson effect; Magnetic fields; Measurement techniques; Physics - Instrumentation and Detectors; Physics - Mesoscale and Nanoscale Physics; Quantum Hall effect; Tellurium
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1710.04090

In the quantum anomalous Hall effect, the edge states of a ferromagnetically doped topological insulator exhibit quantized Hall resistance and dissipationless transport at zero magnetic field. Up to now, however, the resistance was experimentally assessed with standard transport measurement techniques which are difficult to trace to the von-Klitzing constant R\(_K\) with high precision. Here, we present a metrologically comprehensive measurement, including a full uncertainty budget, of the resistance quantization of V-doped (Bi,Sb)\(_2\)Te\(_3\) devices without external magnetic field. We established as a new upper limit for a potential deviation of the quantized anomalous Hall resistance from RK a value of 0.26 +- 0.22 ppm, the smallest and most precise value reported to date. This provides another major step towards realization of the zero-field quantum resistance standard which in combination with Josephson effect will provide the universal quantum units standard in the future.