利用纳米挠曲电性控制氧空位
Controlled manipulation of oxygen vacancies using nanoscale flexoelectricity
摘要：
氧空位，特别是它们的分布，直接耦合到氧化物的电磁性质和相关的新兴功能，在器件应用中有意义。在这里，使用同质外延钛酸锶薄膜，我们展示了一个控制操纵的氧空位分布使用的机械力从扫描探针显微镜针尖。通过结合开尔文探针力显微镜成像和相场模拟，我们表明，氧空位可以在应力梯度诱导的去极化场下移动。当定制时，这种纳米级挠曲电效应能够实现受控的空间调制。在运动中，扫描探针尖端由此确定性地重新配置空位的空间分布。按需局部操纵氧空位的能力为探索介观量子现象和设计多功能氧化物器件提供了工具。
英文摘要：
Oxygen vacancies, especially their distribution, are directly coupled to the electromagnetic properties of oxides and related emergent functionalities that have implication in device applications. Here using a homoepitaxial strontium titanate thin film, we demonstrate a controlled manipulation of the oxygen vacancy distribution using the mechanical force from a scanning probe microscope tip. By combining Kelvin probe force microscopy imaging and phase-field simulations, we show that oxygen vacancies can move under a stress-gradient-induced depolarisation field. When tailored, this nanoscale flexoelectric effect enables a controlled spatial modulation. In motion, the scanning probe tip thereby deterministically reconfigures the spatial distribution of vacancies. The ability to locally manipulate oxygen vacancies on-demand provides a tool for the exploration of mesoscale quantum phenomena, and engineering multifunctional oxide devices.
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