Field-Free Future: The Rise of Quantum Precision in Electronics

Until now, the zero magnetic field Quantum Anomalous Hall effect only occurred at very low currents. This device can change that. Credit: Fijalkowski/JMU

The precise measurement of electrical resistance is essential in the industrial production of electronics – for example, in the manufacture of high-tech sensors, microchips, and flight controls. “Very precise measurements are essential here, as even the smallest deviations can significantly affect these complex systems,” explains Professor Charles Gould, a physicist at the Institute for Topological Insulators at the University of Würzburg .

Thus far, the QAHE was measured only at currents which are far too low for practical metrological use. The reason for this is an electric field that disrupts the QAHE at higher currents. The Würzburg physicists have now developed a solution to this problem. “We neutralize the electric field using two separate currents in a geometry we call a multi-terminal Corbino device,” explains Gould.

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