Current-driven switching of topological spin chirality in a van der Waals antiferromagnet

Abstract: Magnetic topology is central to modern quantum magnet, where spin chirality governs exotic spin winding, real-space Berry phase, and topological Hall effect. A key unresolved challenge is how to electrically switch topological spin chirality and its associated gauge flux, an essential requirement for manipulating its topological quantum properties. In this work, we propose and experimentally demonstrate the concept of current-switching spin chirality. We identify the new vdW antiferromagnet Co1/3TaS2 as an ideal platform, hosting a topological 3Q state with a minimum chirality cell, an ultrahigh skyrmion density, a non-centrosymmetric geometry, and a strong Berry curvature. Using a Co1/3TaS2/Pt heterostructure, we achieve the nonvolatile and reversible switching by current via current-driven spin-orbit torque based on Pts spin Hall effect. Beyond this conventional route, we further discover intrinsic self-torque-induced chirality switching within Co1/3TaS2, driven purely by current, without a magnetic field, and with high energy efficiency. These complementary pathways establish a unified framework for electrically creating and controlling spin chirality. Our results demonstrate a practical route toward chiral spintronics. They can be naturally generalised to other skyrmion systems, offering new opportunities in symmetry control, topological manipulation, and spin-chirality-based quantum functionalities.