Magnetic-resonance-induced nonlinear current response in magnetic Weyl semimetals

TL;DR

This paper predicts a unique nonlinear current response in magnetic Weyl semimetals triggered by magnetic resonance, expanding understanding of their electromagnetic properties and potential applications.

Contribution

It introduces a novel nonlinear current response mechanism in magnetic Weyl semimetals driven by magnetic resonance, differing from previous effects based on symmetry considerations.

Findings

Analytical model predicts the nonlinear current response.

Numerical simulations support the analytical results.

The phenomenon relies on coupling between Weyl electrons and magnetic fluctuations.

Abstract

In this work, we propose a geometric nonlinear current response induced by magnetic resonance in magnetic Weyl semimetals. This phenomenon is in analog to the quantized circular photogalvanic effect previously proposed for Weyl semimetal phases of chiral crystals. However, the nonlinear current response in our case can occur in magnetic Weyl semimetals where time-reversal symmetry, instead of inversion symmetry, is broken. The occurrence of this phenomenon relies on the special coupling between Weyl electrons and magnetic fluctuations induced by magnetic resonance. To further support our analytical solution, we perform numerical studies on a model Hamiltonian describing the Weyl semimetal phase in a topological insulator system with ferromagnetism.