We study the spin-dependent conductance of ballistic mesoscopic ring systems in the presence of an inhomogeneous magnetic field. We show that, for the setup proposed, even a small Zeeman splitting can lead to a considerable spin polarisation of the current. Making use of a spin-switch effect predicted for such systems we propose a device of two rings connected in series that in principle allows for both creating and coherently controlling spin polarized currents at low temperatures.
@article{arxiv.cond-mat/0301064,
title = {Spin Filter Effects in Mesoscopic Ring Structures},
author = {Markus Popp and Diego Frustaglia and Klaus Richter},
journal= {arXiv preprint arXiv:cond-mat/0301064},
year = {2009}
}