Exploring the transport properties of polytypic and twin-plane nanowires: from tunneling phase-time to spin-orbit interaction effects

TL;DR

This paper investigates the transport phenomena in polytypic and twin-plane nanowires, focusing on tunneling phase-time and spin-orbit effects, revealing conditions for negative group velocity propagation and effective spin filtering.

Contribution

It introduces a combined analysis of phase-time and spin transport in nanowires using advanced computational methods, highlighting novel spin filtering mechanisms.

Findings

Conditions for negative group velocity propagation identified.

Effective spin filtering achieved through structural parameter tuning.

Spin dependence strongly influenced by nanowire symmetry and composition.

Abstract

The variety of nanowire crystal structures gave rise to unique and novel transport phenomena. In particular, we have explored the superlattice profile generated by strain field modulation in twinplane nanowires for the tuning of transport channels and the built-in spin-orbit potential profile of polytypic nanowires, in order to realize a spin filter. The Multicomponent Scattering Approach has been used in terms of the Transfer Matrix Method to describe the phase-time of charge carriers. This system showed advantages for attaining conditions for the propagation of wave packets with negative group velocity. Moreover, the spin transport effect of a potential profile with volumetric spin-orbit bulk inversion asymmetry, as present on polytypic nanowires, was described through the Reverse Runge-Kutta Method. Using the peculiar symmetry of the excited states we have characterized a dominant spin dependence on structural parameters that results in effective spin filtering.