Spin-flip Effects in the Mesoscopic Spin-Interferometer

TL;DR

This paper studies how magnetic impurities in a quantum dot within an Aharonov-Bohm interferometer affect electron spin transmission, revealing the influence of exchange interactions on conductance and phase behavior.

Contribution

It introduces a formalism to analyze spin-flip effects in mesoscopic interferometers with magnetic impurities, providing numerical results on transmittance and phase variations.

Findings

Spin-flip and non-flip transmittance amplitudes depend on magnetic field and gate potential.

Exchange interactions significantly influence magnetoconductance fluctuations.

Transmittance phase is affected by magnetic impurities and external parameters.

Abstract

We investigate the properties of the electron spin-transmission through an Aharonov-Bohm interferometer with an embedded multilevel quantum dot containing magnetic impurities. A suitable formalism is developed. The amplitude and the phase of the flip- and nonflip-transmittance are calculated numerically as function of the magnetic field and the gate potential applied on the dot. The effects induced by the exchange interaction to spin-dependent magnetoconductance fluctuations and transmittance phase are shown.