Recently various topological polar structures have been discovered in oxide thin films. Despite the increasing evidence of their switchability under electrical and/or mechanical fields, the dynamic property of isolated ones, which is usually required for applications such as data storage, is still absent. Here, we show the controlled nucleation and motion of isolated three-fold vertices under an applied electric field. At the PbTiO₃/SrRuO₃ interface, a two-unit-cell thick SrTiO₃ layer provides electrical boundary conditions for the formation of three-fold vertices. Utilizing the SrTiO₃ layer and in situ electrical testing system, we find that isolated three-fold vertices can move in a controllable and reversible manner with a velocity up to ~629 nm s⁻¹. Microstructural evolution of the nucleation and propagation of isolated three-fold vertices is further revealed by phase-field simulations. This work demonstrates the ability to electrically manipulate isolated three-fold vertices, shedding light on the dynamic property of isolated topological polar structures.

最近在氧化物薄膜中发现了各种拓扑极性结构。尽管越来越多的证据表明它们在电气和/或机械场下具有可切换性，但隔离器件的动态特性（数据存储等应用通常所需的动态特性）仍然不存在。在这里，我们展示了在施加电场下孤立的三重顶点的受控成核和运动。在PbTiO ₃ /SrRuO ₃界面处，两个晶胞厚的SrTiO ₃层为三重顶点的形成提供了电边界条件。利用SrTiO ₃层和原位电测试系统，我们发现孤立的三重顶点可以以可控和可逆的方式移动，速度高达~629 nm s ^-1 。相场模拟进一步揭示了孤立三重顶点的成核和传播的微观结构演化。这项工作展示了电操纵孤立的三重顶点的能力，揭示了孤立的拓扑极性结构的动态特性。