Controlling Spin-Polarization in Graphene by Cloaking Magnetic and Spin-Orbit Scatterers

TL;DR

This paper demonstrates how a gated ring around spin-dependent scatterers in graphene can effectively control spin-polarized transport properties, such as spin polarization and spin Hall effect, using a wave-function expansion approach.

Contribution

It introduces a method to manipulate spin transport in graphene via engineered gating around magnetic and spin-orbit scatterers, using a continuum Dirac equation model.

Findings

Gated rings can tune spin polarization in graphene.

Control of spin Hall angle achieved through gating.

Spin-dependent scattering cross-sections are effectively manipulated.

Abstract

We consider spin-dependent scatterers with large scattering cross-sections in graphene -a Zeeman-like and an intrinsic spin-orbit coupling impurity- and show that a gated ring around them can be engineered to produce an effcient control of the spin dependent transport, like current spin polarization and spin Hall angle. Our analysis is based on a spin-dependent partial-waves expansion of the electronic wave-functions in the continuum approximation, described by the Dirac equation.