The role of the Rashba coupling in spin current of monolayer gapped graphene

TL;DR

This paper investigates how Rashba spin-orbit coupling influences spin-current generation in gapped monolayer graphene, revealing that spin-current can be enhanced and controlled via coupling strength, band-gap, and electric field direction.

Contribution

It demonstrates the significant role of Rashba coupling in spin-current generation and control in gapped graphene, highlighting the effects of impurity density and electric field orientation.

Findings

Rashba coupling significantly influences spin-current in gapped graphene.

Spin-current increases with Rashba coupling strength and band-gap.

The sign of the spin-current can be controlled by electric field direction.

Abstract

In the current work we have investigated the influence of the Rashba spin-orbit coupling on spin-current of a single layer gapped graphene. It was shown that the Rashba coupling has a considerable role in generation of the spin-current of vertical spins in mono-layer graphene. The behavior of the spin-current is determined by density of impurities. It was also shown that the spin-current of the system could increase by increasing the Rashba coupling strength and band-gap of the graphene and the sign of the spin-current could be controlled by the direction of the current-driving electric field.