Layer-Polarized Anomalous Hall Effects from Inversion-Symmetric Single-Layer Lattices.
basic_science · Level V
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- Record sourced from PubMed, PMID 38214894.
- Also identified by DOI 10.1021/acs.nanolett.3c04597.
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Abstract
In the field of physics and materials science, the discovery of the layer-polarized anomalous Hall effect (LP-AHE) stands as a crucial development. The current research paradigm is rooted in topological or inversion-asymmetric valleytronic systems, making such a phenomenon rather rare. In this work, a universal design principle for achieving the LP-AHE from inversion-symmetric single-layer lattices is proposed. Through tight-binding model analysis, we demonstrate that by stacking into antiferromagnetic van der Waals bilayer lattices, the coupling physics between <i>PT</i> symmetry and vertical external bias can be realized. This coupling reveals the previously neutralized layer-locked Berry curvature, compelling the carriers to move in a specific direction within a given layer, thereby realizing the LP-AHE. Intriguingly, the chirality of the LP-AHE can be effectively switched by modulating the direction of vertical external bias. First-principles calculations validate this mechanism in bilayer T-FeCl<sub>2</sub> and MnPSe<sub>3</sub>. Our results pave the way for new explorations of the LP-AHE.