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Spin filter effects in mesoscopic ring structures

Popp, Markus and Frustaglia, Diego and Richter, Klaus (2003) Spin filter effects in mesoscopic ring structures. Nanotechnology 14, pp. 347-351.

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Other URL: http://stacks.iop.org/0957-4484/14/347

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 set-up proposed, even a small Zeeman splitting can lead to a considerable spin polarization of the current. Making use of a spin- switch effect (Frustaglia ${\it et al}$ 2001 ${\it Phys. Rev. Lett.}$ ${\bf 87}$ 256602) 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.