Mesoscopic Stern-Gerlach spin filter by nonuniform spin-orbit interaction

Details Mesoscopic Stern-Gerlach spin filter by nonuniform spin-orbit interaction Mesoscopic Stern-Gerlach spin filter by nonuniform spin-orbit interaction

2004-09-07

arxiv.org/abs/cond-mat/0409161v2

Phys. Rev. B 72, 041308(R) (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 5 figures (2 color figures), to appear in Phys. Rev. B, Rapid Commun

Scientific paper

10.1103/PhysRevB.72.041308

A novel spin filtering in two-dimensional electron system with nonuniform spin-orbit interactions (SOI) is theoretically studied. The strength of SOI is modulated perpendicular to the charge current. A spatial gradient of effective magnetic field due to the nonuniform SOI causes the Stern-Gerlach type spin separation. The direction of the polarization is perpendicular to the current and parallel to the spatial gradient. Almost 100 % spin polarization can be realized even without applying any external magnetic fields and without attaching ferromagnetic contacts. The spin polarization persists even in the presence of randomness.

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