We utilize electron counting techniques to distinguish a spin conserving fast tunneling process and a slower process involving spin flips in AlGaAs/GaAs-based double quantum dots. By studying the dependence of the rates on the interdot tunnel coupling of the two dots, we find that as many as 4% of the tunneling events occur with a spin flip related to spin-orbit coupling in GaAs. Our measurement has a fidelity of 99 % in terms of resolving whether a tunneling event occurred with a spin flip or not.
@article{arxiv.1512.05149,
title = {Spin orbit coupling at the level of a single electron},
author = {V. F. Maisi and A. Hofmann and M. Röösli and J. Basset and C. Reichl and W. Wegscheider and T. Ihn and K. Ensslin},
journal= {arXiv preprint arXiv:1512.05149},
year = {2016}
}