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We report the results of an analysis, based on a straightforwardquantum-mechanical model, of shot noise suppression in a structure containingcascaded tunneling barriers. Our results exhibit a behavior that is in sharpcontrast with existing semiclassical models for this particular type ofstructure, which predict a limit of 1/3 for the Fano factor as the number ofbarriers is increased. The origin of this discrepancy is investigated andattributed to the presence of localization on the length scale of the mean freepath, as a consequence of the strictly 1-dimensional nature of disorder, whichdoes not create mode mixing, while no localization appears in commonsemiclassical models. We expect localization to be indeed present in practicalsituations with prevalent 1-D disorder, and the existing experimental evidenceappears to be consistent with such a prediction.

Quantum analysis of shot noise suppression in a series of tunnel barriers