Spin transport in high quality suspended graphene devices

TL;DR

This study investigates spin transport in high-quality suspended graphene, revealing long spin relaxation lengths and times, supported by a theoretical model that explains the experimental data.

Contribution

The paper presents the first detailed measurement of spin transport in high mobility suspended graphene and introduces a theoretical model to interpret the results.

Findings

Spin diffusion coefficient of 0.1 m^2/s

Spin relaxation time of approximately 150 ps

Spin relaxation length of 4.7 micrometers

Abstract

We measure spin transport in high mobility suspended graphene (\mu ~ 10^5 cm^2/Vs), obtaining a (spin) diffusion coefficient of 0.1 m^2/s and giving a lower bound on the spin relaxation time (\tau_s ~ 150 ps) and spin relaxation length (\lambda_s=4.7 \mu m) for intrinsic graphene. We develop a theoretical model considering the different graphene regions of our devices that explains our experimental data.