Spin current Kondo effect in frustrated Kondo systems

TL;DR

This paper introduces a spin current Kondo mechanism in frustrated Kondo systems, revealing non-Fermi liquid phases driven by interactions between conduction electron spin currents and localized spin chirality, confirmed by renormalization group analysis.

Contribution

It proposes a novel spin current Kondo mechanism explaining non-Fermi liquid phases in frustrated Kondo models, expanding understanding of spin-liquid states.

Findings

Identification of a spin current Kondo mechanism.

Confirmation via renormalization group analysis.

Potential for experimental detection through spin-current noise.

Abstract

Magnetic frustrations can enhance quantum zero-point motion in spin systems and lead to exotic topological insulating states. When coupled to mobile electrons, they may lead to unusual non-Fermi liquid or metallic spin liquid states whose nature has not been well explored. Here, we propose a spin current Kondo mechanism underlying a series of non-Fermi liquid phases on the border of Kondo and magnetic phases in a frustrated three-impurity Kondo model. This mechanism is confirmed by renormalization group analysis and describes movable Kondo singlets called "holons" induced by an effective coupling between the spin current of conduction electrons and the vector chirality of localized spins. Similar mechanism may widely exist in all frustrated Kondo systems and be detected through spin-current noise measurements.