Quantized electron transport through a time-dependent potential barrier

Electron transport by a potential minimum that moves through a barrier is i nvestigated numerically and theoretically. The integrated electron transfer as a function of the Fermi level has a series of plateaus, each of which c orresponds to an integral number of electrons. The accuracy of the quantiza tion depends on the barrier height and can be 1 part in 10(10) or better. T he transport mechanism involves nonadiabatic Landau-Zener transitions.