Hanle Effect in Transport through Quantum Dots Coupled to Ferromagnetic Leads

TL;DR

This paper proposes transport experiments to study spin precession and the Hanle effect in quantum dots with ferromagnetic leads, enabling measurement of spin lifetime, injection efficiency, and intrinsic spin dynamics.

Contribution

It introduces a novel experimental approach to analyze spin precession and intrinsic spin effects in quantum dots coupled to ferromagnetic contacts.

Findings

Potential to measure spin lifetime in quantum dots

Ability to assess spin injection efficiency

Evidence for Coulomb interaction-driven spin precession

Abstract

We suggest a series of transport experiments on spin precession in quantum dots coupled to one or two ferromagnetic leads. Dot spin states are created by spin injection and analyzed via the linear conductance through the dot, while an applied magnetic field gives rise to the Hanle effect. Such a Hanle experiment can be used to determine the spin lifetime in the quantum dot, to measure the spin injection efficiency into the dot, as well as proving the existence of intrinsic spin precession which is driven by the Coulomb interaction.