Kondo Effect in Nonreciprocal Response

TL;DR

This paper uncovers a Kondo-like logarithmic temperature dependence in the electrical magnetochiral effect caused by quantum fluctuations and chiral spin correlations, revealing new insights into nonreciprocal transport phenomena.

Contribution

It demonstrates that quantum fluctuations and chiral spin correlations induce a Kondo-like effect in nonreciprocal electrical responses, a novel insight into spin-charge interactions.

Findings

Log(T) temperature dependence in magnetochiral effect

Sensitivity to spin chirality and magnetic field

Quantum fluctuations influence transport properties

Abstract

Chiral magnetic states give rise to rich phenomena, from the anomalous Hall effect and the nonlinear electrical current to multiferroics and magnetochiral dichroism. Most of the studies on electrical transport so far have focused on the cases where the magnetic moments are well approximated by classical local moments. Here, we reveal that the coexistence of quantum fluctuations and chiral spin correlations gives rise to a $\log(T)$ temperature dependence in the electrical magnetochiral effect, a nonreciprocal response. Using the Green's function method and a scattering theory approach, we show that the $\log(T)$ temperature dependence occurs through a scattering process similar to that of the Kondo effect. The electrical magnetochiral effect is sensitive to the sign of vector spin chirality and the magnetic field. The results demonstrate that local spin correlations and quantum fluctuations cooperatively induce nontrivial properties in transport phenomena.