Spin-dependent Fano resonance induced by conducting chiral helimagnet contained in a quasi-one-dimensional electron waveguide

TL;DR

This paper demonstrates how a conducting chiral helimagnet embedded in a quasi-one-dimensional electron waveguide induces spin-dependent Fano resonance, which can be used to detect the spin structure of the material.

Contribution

It introduces a model for spin-dependent Fano resonance caused by a chiral helimagnet in a waveguide, revealing a new method for probing spin structures.

Findings

Spin-dependent Fano resonance arises due to spin spiral coupling.

Resonance is sensitive to the helicity of the spiral.

Tuning potential well depth and energy affects the resonance.

Abstract

Fano resonance appears for conduction through an electron waveguide containing donor impurities. In this work, we consider the thin-film conducting chiral helimagnet (CCH) as the donor impurity in a one-dimensional waveguide model. Due to the spin spiral coupling, interference between the direct and intersubband transmission channels gives rise to spin-dependent Fano resonance effect. The spin-dependent Fano resonance is sensitively dependent on the helicity of the spiral. By tuning the CCH potential well depth and the incident energy, this provides a potential way to detect the spin structure in the CCH.