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Spin-depedent transmission of holes through periodically modulated diluted magnetic semiconductor waveguides

X. F. Wang·P. Vasilopoulos
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Abstract

We study spin transport of holes through stubless or stubbed waveguides modulated periodically by diluted magnetic semiconductor (DMS) sections of width b1 . Injected holes of up (down) spin feel a periodically modulated barrier (well) potential in the DMS sections and have different transmission (T) coefficients. T oscillates with b1 for spin-down and decreases fast for spin-up holes while the relative polarization Pr depends nearly periodically on the stub height. Using asymmetric stubs leads to a nearly square-wave pattern in T and to wide plateaus in Pr . T oscillates with the length between the DMS sections. With two DMS sections per unit, T shows periodically wide gaps for spin-down holes when a DMS width is varied. The results can be used to create efficient spin filters.

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X. F. Wang, P. Vasilopoulos. 2002-09-12. Spin-depedent transmission of holes through periodically modulated diluted magnetic semiconductor waveguides. https://doi.org/10.1063/1.1502020

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