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Theory of electric-field-induced spin accumulation and spin current in the two-dimensional Rashba model

V. V. Bryksin·P. Kleinert
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Abstract

Based on the spin-density-matrix approach, both the electric-field-induced spin accumulation and the spin current are systematically studied for the two-dimensional Rashba model. Eigenmodes of spin excitations give rise to resonances in the frequency domain. Utilizing a general and physically well-founded definition of the spin current, we obtain results that differ remarkably from previous findings. It is shown that there is a close relationship between the spin accumulation and the spin current, which is due to the prescription of a quasi-chemical potential and which does not result from a conservation law. Physical ambiguities are removed that plagued former approaches with respect to a spin-Hall current that is independent of the electric field. For the clean Rashba model, the intrinsic spin-Hall conductivity exhibits a logarithmic divergency in the low-frequency regime.

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V. V. Bryksin, P. Kleinert. 2005-12-22. Theory of electric-field-induced spin accumulation and spin current in the two-dimensional Rashba model. https://doi.org/10.1103/physrevb.73.165313

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