Hysteretic behavior in weakly coupled double-dot transport in the spin blockade regime
arXiv:0712.4080 · doi:10.1063/1.2828029
Abstract
Double quantum dot systems in the spin blockade regime exhibit leakage currents that have been attributed to the Hyperfine interaction. We model weakly coupled double-dot transport using a rate equation approach which accounts for Hyperfine 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 analyze the current in the spin blockade region as a function of magnetic field and observe hysteretic behavior for fields corresponding to the crossing between triplet and singlet states.
3 pages and 4 figures. Accepted in APL