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A new multi-layered topological insulator has enabled researchers in the US to achieve fast, highly efficient currents of electrons with no energy loss. Cui-Zu Chang and colleagues at Pennsylvania State University say they have exploited the quantum anomalous Hall (QAH) effect to create a “multi-lane highway’ for electrons, in which the current can be finely tuned. Through further improvements, their design could lead to new advances in quantum computing and small-scale electronic circuits.

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