Scaling behavior of spin transport in hydrogenated graphene

Abstract

We calculate the spin transport of hydrogenated graphene using the Landauer-Büttiker formalism with a spin-dependent tight-binding Hamiltonian. The advantages of using this method is that it simultaneously gives information on sheet resistance and localization length as well as spin relaxation length. Furthermore, the Landauer-Büttiker formula can be computed very efficiently using the recursive Green's function technique. Previous theoretical results on spin relaxation time in hydrogenated graphene have not been in agreement with experiments. Here, we study magnetic defects in graphene with randomly aligned magnetic moments, where interference between spin-channels is explicitly included. We show that the spin relaxation length and sheet resistance scale nearly linearly with the impurity concentration. Moreover, the spin relaxation mechanism in hydrogenated graphene is Markovian only near the charge neutrality point or in the highly dilute impurity limit.

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• Graphane with carbon dimer defects: Robust in-gap states and a scalable two-dimensional platform for quantum computation
• Hydrogen adatoms on graphene: the role of hybridization and lattice distortion
• Critical temperature of two-dimensional hydrogenated multilayer graphene-based diluted ferromagnet
• Breakdown of the Hebel-Slichter effect in superconducting graphene due to the emergence of Yu-Shiba-Rusinov states at magnetic resonant scatterers
• Spin relaxation in disordered graphene: Interplay between puddles and defect-induced magnetism
• Scattering from spin-polarized charged impurities in graphene
• Resilient Intraparticle Entanglement and its Manifestation in Spin Dynamics of Disordered Dirac Materials