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We have carried out calculations of current-voltage characteristics for theelectron tunnel current through a junction with a thin insulating ferroelectricbarrier assuming that interface transmissions for the left and right interfacesnoticeably differ due to dissimilarity of the interfaces. Obtained conductanceversus voltage and current versus voltage curves exhibit well distinguishableasymmetric hysteresis. We show that the asymmetry in the hysteretic effectscould originate from the asymmetric bias voltage profile inside the junction.In particular, we analyze the hysteresis asymmetries occurring when the biasvoltage distribution is low sensitive to the spontaneous polarization reversal.

Electron transport through asymmetric ferroelectric tunnel junctions: current-voltage characteristics