We have achieved the few-electron regime in InAs nanowire double quantum dots. Spin blockade is observed for the first two half-filled orbitals, where the transport cycle is interrupted by forbidden transitions between triplet and singlet states. Partial lifting of spin blockade is explained by spin-orbit and hyperfine mechanisms that enable triplet to singlet transitions. The measurements over a wide range of interdot coupling and tunneling rates to the leads are well reproduced by a simple transport model. This allows us to separate and quantify the contributions of the spin-orbit and hyperfine interactions.
@article{arxiv.1002.2120,
title = {Disentangling the effects of spin-orbit and hyperfine interactions on spin blockade},
author = {S. Nadj-Perge and S. M. Frolov and J. W. W. van Tilburg and J. Danon and Yu. V. Nazarov and R. Algra and E. P. A. M. Bakkers and L. P. Kouwenhoven},
journal= {arXiv preprint arXiv:1002.2120},
year = {2015}
}