Two Anderson impurities in a 2D host with Rashba spin-orbit interaction

TL;DR

This study investigates how Rashba spin-orbit interaction influences the Kondo effect between two impurities in a 2D host, revealing non-monotonic and nearly linear dependencies of the Kondo temperature on the Rashba energy.

Contribution

The paper introduces a modified perturbation theory approach to exactly reproduce spectral moments in the two-impurity Anderson model with Rashba interaction, analyzing Kondo peak behaviors.

Findings

Kondo peaks' height and width depend on impurity distance and Rashba energy.

Kondo temperature exhibits non-monotonic dependence on Rashba energy at small impurity separations.

Kondo temperature increases nearly linearly with Rashba energy, not exponentially.

Abstract

We have studied the two-dimensional two-impurity Anderson model with additional Rashba spin-orbit interaction by means of the modified perturbation theory. The impurity Green's functions we have constructed exactly reproduce the first four spectral moments. We discuss the height and the width of the even/odd Kondo peaks as functions of the inter-impurity distance and the Rashba energy $E_R$ (the strength of the Rashba spin-orbit interaction). For small impurity separations the Kondo temperature shows a non-monotonic dependence on $E_R$ being different in the even and the odd channel. We predict that the Kondo temperature has only almost linear dependence on $E_R$ and not an exponential increase with $E_R$