Spin-Orbit-Mediated Spin Relaxation in Graphene

Details Spin-Orbit-Mediated Spin Relaxation in Graphene Spin-Orbit-Mediated Spin Relaxation in Graphene

2008-12-10

arxiv.org/abs/0812.1921v3

Phys. Rev. Lett. 103, 146801 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Final published version

Scientific paper

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.

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