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- W2963687787 abstract "The recent discovery of the anomalous Hall effect (AHE) in antiferromagnetic(AFM) materials has stimulated the intense exploration of this phenomenon whichmay be useful for the emerging field of AFM spintronics. In all these AHEantiferromagnets, however, the net magnetization is allowed by the magneticspace group symmetry, which may limit their use in AFM spintronics. In thisletter, we predict a nonlinear AHE in the antiferromagnets with symmetryenforced zero net magnetization, thus lifting this limitation. We demonstratethat the presence of a polar axis combined with $widehat{T}widehat{t}_{1/2}$symmetry in collinear AFM materials leads to a finite Berry curvature and thusa non-zero nonlinear AHE. As a specific example, we consider half Heusler alloyCuMnSb, an AFM Weyl metal, and predict that it exhibits a sizable nonlinearAHE. Based on first-principles density functional theory calculations, we showthat multiple Weyl fermions and a large Berry curvature dipole produce ameasurable Hall voltage under conventional experimental conditions. The strongdependence of the Berry curvature dipole on the N'eel vector orientationprovides a new detection scheme of the AFM order based on the nonlinear AHE.Our predictions enrich the material platforms for studying non-trivialphenomena associated with the Berry curvature and broaden the range ofmaterials useful for AFM spintronics." @default.
- W2963687787 created "2019-07-30" @default.
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- W2963687787 date "2019-07-24" @default.
- W2963687787 modified "2023-09-27" @default.
- W2963687787 title "Nonlinear anomalous Hall effect in a collinear antiferromagnetic Weyl metal" @default.
- W2963687787 hasPublicationYear "2019" @default.
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