Magnon Nonlinear Hall Effect in 2D Antiferromagnetic Insulators
arXiv:2410.10355 · doi:10.1103/72sf-6km4
Abstract
The efficient detection of the magnetism in 2D antiferromagnetic (AFM) insulators is crucial for the advancement of 2D AFM spintronics and remains a challenging problem. In this letter, we introduce the magnon nonlinear Hall current, a second-order Hall response of collective spin excitations in ordered magnets, as a novel probe for 2D layered AFM insulators. We theoretically demonstrate that the nonlinear Hall effect is intrinsically coupled to the underlying spin configuration. In particular, it exhibits a pronounced layer dependence in layered antiferromagnets, enabling direct characterization of the nature and strength of interlayer magnetic coupling in multilayer AFM insulators. Furthermore, we show that a a slight external field perturbation can induce and manipulate the magnon nonlinear Hall response. Our work establishes a novel approach for exploring 2D antiferromagnetism and holds great promise for AFM spintronic applications
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