We study spin correlation in a double quantum dot containing a few electrons in each dot (around 10). Clear current rectification with negative differential conductance is observed in the cotunneling regime, which is well explained by a Pauli spin blockade. The current feature is discussed in connection with exchange singlet-triplet splitting based on two simple models, one of which takes coherent interdot coupling and the other incoherent interdot coupling into account.
@article{arxiv.cond-mat/0509232,
title = {Pauli spin blockade in cotunneling transport through a double quantum dot},
author = {H. W. Liu and T. Fujisawa and T. Hayashi and Y. Hirayama},
journal= {arXiv preprint arXiv:cond-mat/0509232},
year = {2016}
}