Electrical Control of Topological States in Co1/3TaS2 Antiferromagnet

Recent research has revealed significant advancements in the control of topological states in materials, specifically focusing on the intercalated van der Waals antiferromagnet Co1/3TaS2. This material exhibits a unique triple-Q (3Q) ground state characterized by topological features. The study, authored by Junghyun Kim, Kaixuan Zhang, Pyeongjae Park, Woonghee Cho, Hyuncheol Kim, and Je-Geun Park, demonstrates that electrical gating can effectively manipulate this topological phase. The findings indicate that by utilizing different cobalt compositions in CoxTaS2 devices, researchers can cover the entire 3Q topological phase through ionic gating.

The research highlights the dense real-space Berry curvature resulting from scalar spin chirality, which contributes to an observable anomalous Hall effect. This work is notable as it represents one of the first instances of electrical control over scalar spin chirality in an antiferromagnetic metal, suggesting potential applications in future spintronic devices. The ability to control topological states electrically could pave the way for advancements in quantum computing and other technologies reliant on topological properties.

The full paper can be accessed at arXiv:2409.02710.