Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2002-09-12
Appl. Phys. Lett. 81, 1636 (2002)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5figures
Scientific paper
10.1063/1.1502020
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.
Vasilopoulos P.
Wang Xiang-Feng
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