We propose realistic methods to detect local spin polarization, which utilize a quantum dot side coupled to the target system. By choosing appropriate states in the dot, we can put spin selectivity to the dot and detect spins in the target with small disturbance. We also present an experiment which realizes one of the proposed spin detection schemes in magnetic fields.
@article{arxiv.0902.4329,
title = {Detection of spin polarization with a side coupled quantum dot},
author = {Tomohiro Otsuka and Eisuke Abe and Yasuhiro Iye and Shingo Katsumoto},
journal= {arXiv preprint arXiv:0902.4329},
year = {2011}
}