Electromagnetic response in spiral magnets and emergent inductance

TL;DR

This paper develops a microscopic theoretical framework for emergent inductance in spiral magnets, revealing how collective modes influence electromagnetic responses and enabling design of inductors with tailored properties.

Contribution

It provides the first detailed microscopic theory of emergent inductance in spiral magnets, linking collective modes to electromagnetic response characteristics.

Findings

The system remains metallic in one dimension unlike collinear spin-density waves.

The conjugate relation between magnetization and phason coordinate determines inductance properties.

The theory enables designing emergent inductance with specific desired features.

Abstract

Emergent electromagnetism in magnets originates from the strong coupling between conduction electron spins and those of noncollinear ordered moments and the consequent Berry phase. This offers possibilities to develop new functions of quantum transport and optical responses. The emergent inductance in spiral magnets is an example recently proposed and experimentally demonstrated, used the emergent electric field induced by alternating currents. However, the microscopic theory of this phenomenon is missing, which should reveal the factors to determine the magnitude, sign, frequency dependence, and nonlinearity of the inductance L. Here we theoretically study electromagnetic responses of spiral magnets taking into account their collective modes. In sharp contrast to the collinear spin-density wave, the system remains metallic even in one-dimension, and the canonical conjugate relation of uniform magnetization and phason coordinate plays an essential role, determining the properties of L. This result opens a way to design the emergent inductance of desired properties.