标题： 拓扑绝缘体薄膜中的量子振荡介导的RKKY耦合 显示英文标题

标题： Zitterbewegung-mediated RKKY coupling in topological insulator thin films

摘要： 拓扑绝缘体（TI）薄膜中巡游电子的动力学使用多带分解方法进行研究。我们表明，二维薄膜中的电子轨迹是各向异性的，并被限制在一个特征区域内。值得注意的是，电子轨迹的约束和各向异性与TI系统的拓扑相变相关，这可以通过调节薄膜厚度和/或施加面内磁场来控制。此外，在相变点，TI薄膜系统中可以实现持续的电子波包振荡，这可能有助于实验检测抖动运动（Zitterbewegung）。还讨论了电子运动微观图景在解释其他与输运相关的效应中的意义，例如TI薄膜系统中的电子介导RKKY耦合。 显示英文摘要

摘要： The dynamics of itinerant electrons in topological insulator (TI) thin films is investigated using a multi-band decomposition approach. We show that the electron trajectory in the 2D film is anisotropic and confined within a characteristic region. Remarkably, the confinement and anisotropy of the electron trajectory are associated with the topological phase transition of the TI system, which can be controlled by tuning the film thickness and/or applying an in-plane magnetic field. Moreover, persistent electron wavepacket oscillation can be achieved in the TI thin film system at the phase transition point, which may assist in the experimental detection of the jitter motion (Zitterbewegung). The implications of the microscopic picture of electron motion in explaining other transport-related effects, e.g., electron-mediated RKKY coupling in the TI thin film system, are also discussed.