Hysteretic behavior in weakly coupled double-dot transport in the spin blockade regime

Details Hysteretic behavior in weakly coupled double-dot transport in the spin blockade regime Hysteretic behavior in weakly coupled double-dot transport in the spin blockade regime

2007-12-25

arxiv.org/abs/0712.4080v1

Applied Physics Letters, 91, 252112, (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

3 pages and 4 figures. Accepted in APL

Scientific paper

10.1063/1.2828029

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.

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