We investigate electron scattering by time-periodic potentials of finite range in one dimension. A general scattering potential is approximated by a sequence of rectangular barriers, and can be handled within a multiple-scattering approach. The scattering is described in terms of a scattering-amplitude operator which takes into account propagating as well as evanescent states. The general properties of this operator are discussed. Our approach permits us to study the transport in time-periodic mesoscopic systems. In particular, we investigate quantum-coherent pumping of electrons. [References: 19]
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