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Ballistic spin transport, through periodically stubbed waveguides, is studiedin the presence of a weak spin-orbit interaction (SOI) and the resultingsubband mixing. By an appropriate choice of the waveguide length and of thestub parameters injected spin-polarized electrons can be blocked completely andthe transmission shows a periodic and nearly square-wave pattern with wide gapswhen only one mode is allowed to propagate in the waveguide. Relative to thecase when subband mixing is neglected, the transmission changes drastically asa function of the incident electron energy or of the stub height, as itexhibits new peaks or dips, but remains robust as a function of the stubs'degree of asymmetry. Varying the strength of the SOI parameter changes therelative contribution to the total transmission or conductance of the spin-upand spin-down states. The structure considered is a reasonable candidate forestablishing a spin transistor.

Influence of subband mixing due to spin-orbit interaction on the transmission through periodically modulated waveguides