Nonlinear spin Hall effect in $\mathcal{P}\mathcal{T}$-symmetric collinear magnets

Abstract

We theoretically investigate a nonlinear spin Hall effect in $\mathcal{P}\mathcal{T}$-symmetric antiferromagnetic metals, which serve as an efficient spin current generator. We elucidate that an emergent spin-dependent Berry curvature dipole is a microscopic origin of the nonlinear spin Hall effect, which becomes nonzero with neither relativistic spin-orbit coupling, uniform magnetization, nor spin-split band structure. By analyzing a microscopic antiferromagnetic model without spin-orbit coupling for an intuitive understanding of the phenomena, we elucidate essential hopping processes and a condition to enhance the nonlinear spin Hall conductivity. We also provide a complete table to include useful correspondence among the Néel vector, odd-parity multipoles, nonlinear spin conductivity tensor, and candidate materials in all the $\mathcal{P}\mathcal{T}$-symmetric black-and-white magnetic point groups.

9 pages, 5 figures, 3 tables

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