Pure spin current in graphene NS structures

TL;DR

This paper proposes theoretical device structures using graphene NS junctions to generate pure spin currents by filtering charge from spin-polarized currents, leveraging specular Andreev reflection.

Contribution

It introduces novel device configurations in graphene to produce pure spin currents based on specular Andreev reflection, a recently predicted phenomenon.

Findings

Theoretical demonstration of pure spin current generation in graphene NS structures.

Proposal of two device structures utilizing normal-superconductor junctions.

Potential applications in spintronics with efficient spin current control.

Abstract

We demonstrate theoretically the possibility to produce a pure spin current in graphene by filtering the charge from a spin-polarized electric current. To achieve this effect, which is based on the recently predicted property of specular Andreev reflection in graphene, we propose two possible device structures containing normal-superconductor (NS) junctions.