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Spin-Orbit-Mediated Spin Relaxation in Graphene

2009; American Physical Society; Volume: 103; Issue: 14 Linguagem: Inglês

10.1103/physrevlett.103.146801

1092-0145

Daniel Huertas‐Hernando, F. Guinea, Arne Brataas,

Topological Materials and Phenomena

We investigate how spins relax in intrinsic graphene. The spin-orbit coupling arises from the band structure and is enhanced by ripples. The orbital motion is influenced by scattering centers and ripple-induced gauge fields. Spin relaxation due to Elliot-Yafet and Dyakonov-Perel mechanisms and gauge fields in combination with spin-orbit coupling are discussed. In intrinsic graphene, the Dyakonov-Perel mechanism and spin flip due to gauge fields dominate and the spin-flip relaxation time is inversely proportional to the elastic scattering time. The spin-relaxation anisotropy depends on an intricate competition between these mechanisms. Experimental consequences are discussed.