Oxygen octahedral tilts are known for the ability to tailor polarization patterns in perovskites. We propose a way to manipulate nanoscale polarization patterns in ferroelectric tunnel junctions (FTJs) by oxygen octahedral tilts in electrodes combined with interface engineering. Here the electrode is epitaxial SrRuO₃ on SrTiO₃, and the ferroelectric barrier is a BaTiO₃/CaTiO₃ superlattice. The octahedral tilt mismatch between electrodes and the barrier is found to be eliminated at one of the two most stable interfaces by the imprinting of in-phase oxygen octahedral tilt from electrodes into the barrier, which further results in anti-polar order in the barrier, while uniform polar order is retained for another stable interface. Further analysis of electronic transport properties shows an increased transmission in FTJ with anti-polar order, which is mainly caused by octahedral tilt induced out-of-plane ferroelectric domain walls. Our results indicate that the oxygen octahedral tilts in electrodes can be used to manipulate polarization patterns and create charged domain walls in FTJs, which further expand the application prospects of FTJ-based devices.

中文翻译：

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通过电极中的八面体倾斜调整铁电隧道结中的纳米级极化模式和传输特性

氧八面体倾斜以在钙钛矿中调整极化模式的能力而闻名。我们提出了一种通过电极中的氧八面体倾斜结合界面工程来控制铁电隧道结 (FTJ) 中纳米级极化模式的方法。这里的电极是SrTiO ₃上的外延 SrRuO ₃，铁电势垒是 BaTiO ₃ /CaTiO ₃超晶格。发现电极和势垒之间的八面体倾斜失配通过将同相氧八面体倾斜从电极压印到势垒中而在两个最稳定的界面之一消除，这进一步导致势垒中的反极性顺序，同时为另一个稳定的界面保留均匀的极性顺序。对电子传输特性的进一步分析表明，具有反极性顺序的 FTJ 中的传输增加，这主要是由八面体倾斜引起的平面外铁电畴壁引起的。我们的结果表明，电极中的氧八面体倾斜可用于操纵极化模式并在 FTJ 中创建带电畴壁，这进一步扩展了基于 FTJ 的器件的应用前景。