We consider theoretically transport in a spinfull one-channel interacting quantum wire placed in an external magnetic field. For the case of two point-like impurities embedded in the wire, under a small voltage bias the spin-polarized current occurs at special points in the parameter space, tunable by a single parameter. At sufficiently low temperatures complete spin-polarization may be achieved, provided repulsive interaction between electrons is not too strong.
@article{arxiv.0909.0025,
title = {Spin-filtering by field dependent resonant tunneling},
author = {Zoran Ristivojevic and George I. Japaridze and Thomas Nattermann},
journal= {arXiv preprint arXiv:0909.0025},
year = {2010}
}