Abstract
Theoretical analysis has been performed on the relationship between the nonequilibrium spin and the spin flux, which arises for carriers in an asymmetrical quantum well or in a quantum well (QW) in semiconductors without an inversion center. It has been shown that in the presence of a nonequilibrium spin with density S, the correlation between the spin and the momentum of carriers leads to a spin flux J in the QW plane. In its turn, this spin flux produces the nonequilibrium spin polarization. The most typical manifestations of the relationship between S and J have been considered, in particular, spin relaxation by Dyakonov-Perel mechanism and the appearance of an effective magnetic field in the case of the directional motion of the carriers.
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