Nonreciprocal Transport in Noncoplanar Magnetic Systems without Spin-Orbit Coupling, Net Scalar Chirality, or Magnetization

TL;DR

This paper introduces a novel mechanism for nonlinear nonreciprocal transport in magnetic systems driven by local scalar chirality, independent of spin-orbit coupling, net scalar chirality, or magnetization, using a bilayer triangular lattice model.

Contribution

It reveals that local scalar chirality alone can induce nonreciprocal transport without relativistic effects or net magnetization, expanding understanding of transport phenomena in magnetic materials.

Findings

Nonreciprocal transport arises from local scalar chirality.

Asymmetric band modulation correlates with nonreciprocal transport.

The mechanism operates without spin-orbit coupling or net magnetization.

Abstract

We propose a new mechanism of nonlinear nonreciprocal transport in magnetic systems. By considering a noncoplanar magnetic ordering on a bilayer triangular lattice, we clarify that a local scalar chirality degree of freedom is a source of nonreciprocal transport, which does not require any relativistic spin-orbit coupling, net scalar chirality, and net magnetization. We show a close relationship between the asymmetric band modulation and the nonreciprocal transport under the noncoplanar magnetic ordering based on the model-parameter dependences in the real-space picture.