Mesoscopic Stern-Gerlach device to polarize spin currents

Details Mesoscopic Stern-Gerlach device to polarize spin currents Mesoscopic Stern-Gerlach device to polarize spin currents

2002-07-22

arxiv.org/abs/cond-mat/0207533v2

Phys.Rev. B 67, 041307(R) (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Updated to the published version

Scientific paper

10.1103/PhysRevB.67.041307

Spin preparation and spin detection are fundamental problems in spintronics and in several solid state proposals for quantum information processing. Here we propose the mesoscopic equivalent of an optical polarizing beam splitter (PBS). This interferometric device uses non-dispersive phases (Aharonov-Bohm and Rashba) in order to separate spin up and spin down carriers into distinct outputs and thus it is analogous to a Stern-Gerlach apparatus. It can be used both as a spin preparation device and as a spin measuring device by converting spin into charge (orbital) degrees of freedom. An important feature of the proposed spin polarizer is that no ferromagnetic contacts are used.

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