  Based on the spin-orbit coupling recently implemented in a neutral cold-atom
gas, we propose a scheme to realize spin-dependent scattering of cold atoms. In
particular we consider a matter wave packet of cold-atom gas impinging upon a
step potential created by the optical light field, inside of which the atoms
are subject to spin-orbit interaction. We show that the proposed system can act
as a spin polarizer or spin-selective atom mirror for the incident atomic beam.
The principle and the operating parameter regime of the system are carefully
discussed.
