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Spin-orbit-mediated spin relaxation in graphene.

D Huertas-Hernando¹, F Guinea, Arne Brataas

¹Department of Physics, Norwegian University of Science and Technology, NO-7491, Trondheim, Norway.

Physical Review Letters

|November 13, 2009

Summary

In intrinsic graphene, spin relaxation is dominated by the Dyakonov-Perel mechanism and gauge fields. Spin-flip relaxation time inversely correlates with elastic scattering time.

Area of Science:

Condensed Matter Physics
Materials Science
Spintronics

Background:

Understanding spin relaxation mechanisms in 2D materials like graphene is crucial for spintronic applications.
Intrinsic graphene possesses unique electronic properties influenced by its band structure and potential imperfections.
Spin-orbit coupling and ripple-induced effects are key factors affecting electron spin dynamics.

Purpose of the Study:

To investigate the dominant spin relaxation mechanisms in intrinsic graphene.
To analyze the influence of spin-orbit coupling, scattering centers, and ripple-induced gauge fields on spin dynamics.
To determine the relationship between spin-flip relaxation time and elastic scattering time.

Main Methods:

Theoretical analysis of spin relaxation processes, including Elliot-Yafet and Dyakonov-Perel mechanisms.

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Modeling the effects of ripple-induced gauge fields in combination with spin-orbit coupling.

Investigating the role of scattering centers on orbital motion.

Main Results:

The Dyakonov-Perel mechanism and spin flip due to gauge fields are identified as dominant in intrinsic graphene.
The spin-flip relaxation time is found to be inversely proportional to the elastic scattering time.
Spin-relaxation anisotropy arises from a complex interplay between these relaxation mechanisms.

Conclusions:

Intrinsic graphene exhibits dominant spin relaxation via the Dyakonov-Perel mechanism and gauge field effects.
The elastic scattering time critically influences the spin relaxation rate.
The findings provide insights into controlling spin lifetimes for potential spintronic devices.