Quantum ruler measures and explores strange properties of twisted materials

https://phys.org/news/2023-10-quantum-ruler-explore-exotic.html

"twisted quantum ruler cooled 1/100th° above absolute 0 varies strong external magnetic strength for designing and manufacturing semiconductors... determining electrical and magnetic properties of moiré graphene bilayers:... area enclosed by electrons' circular orbit multiplied by applied magnetic field shifted by amount dependent on bilayers' magnetization... anomalous quantum Hall resistance (most precise standard) portably calibrated for electronics directly at factory saving millions of dollars"

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