Pseudospin-driven spin relaxation mechanism in graphene

摘要: The prospect of transporting spin information over long distances in graphene, possible because its small intrinsic spin–orbit coupling (SOC) and vanishing hyperfine interaction, has stimulated intense research exploring spintronics applications. However, measured relaxation times are orders magnitude smaller than initially predicted, while the main physical process for dephasing charge-density disorder dependences remain unconvincingly described by conventional mechanisms. Here, we unravel a mechanism non-magnetic samples that follows from an entanglement between pseudospin driven random SOC, unique to graphene. mixing pseudospin-related Berry’s phases results fast even when approaching ballistic limit, with increasing away Dirac point, as observed experimentally. SOC can be caused adatoms, ripples or substrate, suggesting novel manipulation strategies based on degree freedom. Spin graphene is much faster theoretically expected. Now, scenario degrees freedom defect-induced spatial variations predicts longer times.