Role of Dynamic Nuclear Polarization on the Transport Through Weakly Coupled Double Quantum Dots Articles uri icon

publication date

  • September 2008

start page

  • 195104


  • 19


  • 41

International Standard Serial Number (ISSN)

  • 0022-3727

Electronic International Standard Serial Number (EISSN)

  • 1361-6463


  • 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.