Pauli spin blockade with site-dependent g-tensors and spin-polarized leads

TL;DR

This paper introduces a method using Pauli spin blockade with site-dependent g-tensors and spin-polarized leads to fully characterize g-tensors in double quantum dots, enhancing measurement robustness and revealing spin polarization effects.

Contribution

It demonstrates that magnetotransport experiments can determine g-tensors and spin polarization in quantum dots with improved noise resilience and signal strength.

Findings

Complete g-tensor characterization via magnetotransport

Enhanced magnetotransport signals with specific polarization configurations

Leakage current reveals lead spin polarization when spin-orbit interaction is considered

Abstract

Pauli spin blockade (PSB) in double quantum dots (DQDs) has matured into a prime technique for precise measurements of nanoscale system parameters. In this work we demonstrate that systems with site-dependent g-tensors and spin-polarized leads allow for a complete characterization of the g-tensors in the dots by magnetotransport experiments alone. Additionally, we show that special polarization configurations can enhance the often elusive magnetotransport signal, rendering the proposed technique robust against noise in the system, and inducing a giant magnetoresistance effect. Finally, we incorporate the effects of the spin-orbit interaction (SOI) and show that in this case the leakage current contains information about the degree of spin polarization in the leads.