Resonant Landau-Zener transitions in helical magnetic fields

TL;DR

This paper investigates spin-dependent electron transport in magnetic semiconductor nanowires with helical magnetic fields, revealing additional conductance dips caused by resonant Landau-Zener transitions in the non-adiabatic regime.

Contribution

It demonstrates the occurrence of additional conductance dips due to resonant Landau-Zener transitions, expanding understanding of spin transport in helical magnetic fields.

Findings

Additional conductance dips occur at magnetic fields different from the helical-field amplitude.

Resonant Landau-Zener transitions explain the conductance features in the non-adiabatic regime.

The study enhances understanding of spin transport phenomena in magnetic nanostructures.

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 $B_h$ -- the additional conductance dips (with zero conductance) appear at magnetic field different from $B_h$. This effect occuring in the non-adiabatic regime is explained as resulting from the resonant Landau-Zener transitions between the spin-splitted subbands.