Spin Filter Effects in Mesoscopic Ring Structures
arXiv:cond-mat/0301064 · doi:10.1088/0957-4484/14/2/347
Abstract
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.
5 pages, 8 figures