Spin and charge distributions in Graphene/Nickel (111) substrate under Rashba spin-orbital coupling

TL;DR

This study uses Monte Carlo simulations to analyze spin and charge distributions in Graphene/Nickel(111) under Rashba spin-orbit coupling at room temperature, revealing key factors influencing spin splitting and electron escape behaviors.

Contribution

The paper introduces a Monte Carlo model to explain room-temperature Rashba effects and spin distributions in Graphene/Nickel(111), providing insights into spintronic applications.

Findings

Exchange fluctuation rate influences Rashba spin-orbit splitting.

Electrons escape from edges upon heating, with Gaussian distribution inside.

Model explains experimental observations of Rashba effect at room temperature.

Abstract

To understand the coupling factor between Rashba spin-orbital interaction and ferromagnetic proximity effect, we design a Monte Carlo algorithm to simulate the spin and charge distributions for the room-temperature Rashba material, Graphene/Nickel(111) substrate, at finite temperature. We observe that the rate of exchange fluctuation is a key player to produce giant Rashba spin-orbit splitting in graphene. More importantly, we monitor the Rashba spin-splitting phenomenon where the spin-polarized electrons may be escaped from two opposite edges upon heating. However, the escaped electrons show Gaussian-like distribution in interior area that is important for spintronic engineers to optimize the efficiency of spin-state detection. In addition, we investigate if our Monte Carlo model can explain why room-temperature Rashba effect is observed in Graphene/Nickel(111) substrate experimentally. All results are presented in physical units.