Kondo Quantum Dots and the Novel Kondo-doublet interaction

TL;DR

This paper investigates the enhanced Kondo-doublet interaction between two quantum dots connected by a Rashba-active wire, revealing it surpasses RKKY interaction and can be controlled via spin-orbit coupling, challenging previous assumptions.

Contribution

It demonstrates that the Kondo-doublet interaction can dominate over RKKY in quantum dot systems with spin-orbit coupling, providing new insights into spin interactions.

Findings

Kondo-doublet interaction exceeds RKKY by over an order of magnitude.

Spin-orbit coupling allows control over quantum dot spin correlations.

Revises the assumption that RKKY is the dominant impurity interaction.

Abstract

We analyze the interactions between two Kondo Quantum Dots connected to a Rashba-active Quantum Wire. We find that the Kondo-doublet interaction, at an inter-dot distance of the order of the wire Fermi length, is over an order of magnitude greater than the RKKY interaction. The effects induced on the Kondo-doublet interaction by the wire spin-orbit coupling can be used to control the Quantum Dots spin-spin correlation. These results imply that the widely used assumption that the RKKY is the dominant interaction between Anderson impurities must be revised.