Abstract
The spin Coulomb drag (SCD) constitutes an intrinsic source of dissipation for spin currents generated by charged carriers. We discuss the physical origin of the effect, which is due to Coulomb scattering between carriers of opposite spin moving with different velocities, distinguishing between three-, two-, and one-dimensional systems. An overview is given of the various practical implications of the SCD effect for spintronics, where it plays an important role in spin injection and drift-diffusion in semiconductors, and in the power loss of spin circuits. The SCD also affects spin-optical excitations and contributes to the linewidth of spin plasmons. We discuss how the effect can be viewed in the context of time-dependent density-functional response theory.
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