Researchers at Tohoku University and the Japan Atomic Energy Agency (JAEA) have successfully controlled a unique quantum phenomenon—the quantum-geometric nonlinear Hall (QgNLH) state—using electric current for the first time. The breakthrough was achieved by revealing and exploiting the coupling between the spin structure and the QgNLH state in an electrically switchable chiral antiferromagnet.

The achievements, published in the journal Newton on Nov. 4, 2026, offer a potential approach for developing electrically tunable devices that use quantum-geometric effects to perform nonlinear signal processing functions.