  We study the in-plane transport of spin-polarized electrons in III-V
semiconductor quantum wells. The spin dynamics is controlled by the spin-orbit
interaction, which arises via the Dresselhaus (bulk asymmetry) and Rashba (well
asymmetry) mechanisms. This interaction, owing to its momentum dependence,
causes rotation of the spin polarization vector, and also produces effective
spin dephasing. The density matrix approach is used to describe the evolution
of the electron spin polarization, while the spatial motion of the electrons is
treated semiclassically. Monte Carlo simulations have been carried out for
temperatures in the range 77-300 K.
