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Based on the structure predicted in a ferroelectric tunnel junction in theresent density functional theory study, we investigate the electron transportthrough the FTJ with asymmetric interfaces, i.e., one interface dipole ispinned and the other interface dipole is switchable. Tuneling electroresistancecan be induced due to the nonswitchable interface dipole in FTJs with symmetricelectrodes. Compared with the dependence relationship between TER and thepolarization of switchable interface, TER is not sensitive to the variation ofthe polarization of pinned interface. A large TER can be achieved when thepinned polarization points to the ferroelectric film and low interfacedielectric constants. In addition, effect of electrode on TER in the structureis also discussed.

Pinned interface dipole-induced tunneling electroresistance in ferroelectric tunnel junctions