Abstract
The spin-orbit-interaction in conjunction with the absence of inversion symmetry causes a lifting of the spin degeneracy for the conduction band of III-V-compounds. This spin splitting can be thought to arise from an effective internal magnetic field Beff which in two ways acts on the spins of conduction electrons as they are emitted through the band-bending region of a GaAs (110)/(Cs, 0) photocathode surface: 1) The electron spin polarization vector P precesses about Beff and 2) originally unpolarized electrons acquire a non-zero spin polarization along the preferential axis given by Beff.
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