Resonant Landau-Zener transitions in helical magnetic fields
Abstract
The spin-dependent electron transport has been studied in magnetic semiconductor waveguides (nanowires) in the helical magnetic field. We have shown that -- apart from the known conductance dip located at the magnetic field equal to the helical-field amplitude Bh -- the additional conductance dips (with zero conductance) appear at magnetic field different from Bh. This effect occuring in the non-adiabatic regime is explained as resulting from the resonant Landau-Zener transitions between the spin-splitted subbands.
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