Microscopic mechanism for intrinsic nonlinear anomalous Hall conductivity in noncollinear antiferromagnetic metals

TL;DR

This paper theoretically explores the intrinsic nonlinear anomalous Hall effect in antiferromagnetic metals with space-time symmetry, revealing its origin from magnetic multipoles and antisymmetric spin-orbit interactions.

Contribution

It introduces a multipole-based framework and a tight-binding model to explain the microscopic origin of the INAHE in noncollinear antiferromagnetic metals.

Findings

INAHE is characterized by an asymmetric, non-dissipative second-order conductivity tensor.

Emergence of INAHE is linked to odd-parity magnetic quadrupoles or toroidal dipoles.

Effective coupling between magnetic order and antisymmetric spin-orbit interaction drives INAHE.

Abstract

We theoretically investigate an intrinsic nonlinear anomalous Hall effect (INAHE) in space-time ($\mathcal{PT}$) symmetric antiferromagnetic metals. The INAHE is characterized by an asymmetric and non-dissipative part of the second-order electric conductivity tensor in the clean limit in contrast to the Drude-type symmetric conductivity tensor with dissipation. By introducing a multipole description, we show that the emergence of the INAHE is due to active odd-parity magnetic quadrupoles or magnetic toroidal dipoles under magnetic orderings. In order to clarify the microscopic origin of the INAHE, we specifically consider a fundamental tight-binding model of a three-dimensional tetragonal system. We demonstrate that the INAHE arises from the effective coupling between magnetic ordering and antisymmetric spin--orbit interaction. We also discuss essential electron hopping paths driving the INAHE.