  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.
