Kondo effect in a Aharonov-Casher interferometer

TL;DR

This paper studies how the Kondo effect interacts with Aharonov-Casher interference in a spin field-effect transistor model, revealing that spin-orbit interaction induces a persistent current regardless of lead polarization.

Contribution

It introduces a model combining Kondo physics with Aharonov-Casher effects in a spin transistor, analyzing the impact of spin-orbit interaction and lead polarization on current and Kondo temperature.

Findings

Spin-orbit interaction causes a non-zero current even with fully polarized leads.

The Aharonov-Casher phase influences the Kondo temperature.

Persistent current exists regardless of lead spin polarization.

Abstract

We consider a model describing a spin field-effect transistor based on a quantum nanowire with a tunable spin-orbit interaction embedded between two ferromagnetic leads with anticollinear magnetization. We investigate a regime of a strong interplay between resonance Kondo scattering and interference associated with the Aharonov-Casher effect. Using the Keldysh technique at weak coupling regime we calculate perturbatively the charge current. It is predicted that the effects of the spin-orbit interaction result in a non-vanishing current for any spin polarization of the leads including the case of fully polarized anti-collinear contacts. We analyze the influence of the Aharonov-Casher phase and degree of spin polarization in the leads onto a Kondo temperature.