- September 2008
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- We study the electronic transport through a weakly coupled double quantum dot in the spin blockade (SB) regime. These systems show leakage currents that have been attributed to hyperfine (HF) interactions. We model weakly coupled double-dot transport using a rate equation approach which accounts for HF flip-flop transitions. The rate equations allow us to obtain self-consistently the time evolution for electronic charge occupations and for the nuclei polarizations in each dot. We analyse the current in the SB region as a function of magnetic field and source&-drain voltage. We observe current steps for both variables corresponding to the crossings between triplet and singlet states. Hysteretic behaviour has also been observed.