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. 2015 Apr 8;5:9680. doi: 10.1038/srep09680

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(a) Energy band diagram for the whole SRO/BFO/Nb-STO heterojunction; (b, c) present the schematic band diagrams for a p-n junction at two different ferroelectric polarization directions, with downward polarization state (b) and upward polarization state (c), corresponding to the LRS and HRS, respectively.