Spin filtering effect generated by the inter-subband spin-orbit coupling in the bilayer nanowire with the quantum point contact

TL;DR

This paper proposes a new spin filtering mechanism in bilayer nanowires with quantum point contacts, driven by lateral inter-subband spin-orbit coupling, hybridization of states, and quantum confinement effects.

Contribution

It introduces a novel spin filtering effect based on lateral inter-subband spin-orbit coupling in bilayer nanowires, supported by theoretical analysis.

Findings

Demonstrates the spin filtering mechanism via Landau-Zener inter-subband transitions

Shows the role of lateral Rashba spin-orbit interaction in spin filtering

Highlights the influence of quantum point contact confinement on spin transport

Abstract

The spin filtering effect in the bilayer nanowire with quantum point contact is investigated theoretically. We demonstrate the new mechanism of the spin filtering based on the lateral inter-subband spin-orbit coupling, which for the bilayer nanowires has been reported to be strong. The proposed spin filtering effect is explained as the joint effect of the Landau-Zener inter-subband transitions caused by the hybridization of states with opposite spin (due to the lateral Rashba SO interaction) and the confinement of carriers in the quantum point contact region.