The structure of the spin diffusion equations for a system with weak Rashba spin-orbit interaction in an electric field is reinvestigated. A simple equation, which also contains the coupling between spins and charges, is obtained. The equation is applied to a number of situations including complete electrical spin manipulation, spin-galvanic current after optical excitation, and the spin-Hall effect.
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O. Bleibaum (2006) studied this question.
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