Kondo effect in transport through Aharonov-Bohm and Aharonov-Casher interferometers

TL;DR

This paper extends the Hubbard model to include spin-orbit coupling effects in ring interferometers, analyzing how these influence Kondo phenomena and enable spin polarization in conductance.

Contribution

The work introduces a novel extension of the Hubbard model that accurately incorporates Rashba spin-orbit coupling in ring geometries under magnetic and electric fields.

Findings

Spin-orbit coupling significantly reduces conductance in the Kondo regime.

Magnetic flux combined with spin-orbit effects can generate spin-polarized carriers.

The formalism describes both Kondo and interference effects in ring conductors.

Abstract

We derive the extension of the Hubbard model to include Rashba spin-orbit coupling that correctly describes Aharonov-Bohm and Aharonov-Casher phases in a ring under applied magnetic and electric fields. When the ring is connected to conducting leads, we develop a formalism that is able to describe both, Kondo and interference effects. We find that in the Kondo regime, the spin-orbit coupling reduces strongly the conductance from the unitary limit. This effect in combination with the magnetic flux, can be used to produce spin polarized carriers.