Spin accumulation without spin current

Abstract

The spin Hall (SH) effect is a phenomenon in which the spin current flows perpendicular to an applied electric field and causes the spin accumulation at the boundaries. However, in the presence of spin-orbit couplings, the spin current is not well defined. Here, we calculate the spin response to an electric-field gradient, which naturally appears at the boundaries. We derive a generic formula using the Bloch wave functions and the phenomenological relaxation time. We also calculate the response for the uniform Rashba model with $\delta$-function nonmagnetic disorder within the first-order Born approximation and corresponding vertex corrections. We find the nonzero spin accumulation, although the SH conductivity exactly vanishes.

arXiv comment6 pages, 2 figures, Supplemental Material is available in the source

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• Effect of vertex corrections on the enhancement of Gilbert damping in spin pumping into a two-dimensional electron gas
• Magnetic parity violation and parity-time-reversal-symmetric magnets
• Theory of inverse Rashba-Edelstein effect induced by spin pumping into a two-dimensional electron gas
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• Theory of spin pumping and inverse Rashba-Edelstein effect in a two-dimensional electron gas
• Intrinsic spin accumulation in the magnetic spin Hall effect