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Spin-dependent electron transport in a periodically stubbed quantum wire inthe presence of Rashba spin-orbit interaction (SOI) is studied via thenonequilibrium Green's function method combined with the Landauer-Buttikerformalism. The coexistence of spin filtering, charge and spin switching arefound in the considered system. The mechanism of these transport properties isrevealed by analyzing the total charge density and spin-polarized densitydistributions in the stubbed quantum wire. Furthermore, periodic spin-densityislands with high polarization are also found inside the stubs, owing to theinteraction between the charge density islands and the Rashba SOI-inducedeffective magnetic field. The proposed nanostructure may be utilized to devisean all-electrical multifunctional spintronic device.

Spin-filtering and charge- and spin-switching effects in a quantum wire with periodically attached stubs