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arXiv 2006.09598cond-mat.mes-hallquant-ph
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拓扑绝缘体薄膜中Zitterbewegung介导的RKKY耦合

Zitterbewegung-mediated RKKY coupling in topological insulator thin films

Cong Son Ho, Zhuo Bin Siu, Seng Ghee Tan, Mansoor B. A. Jalil

摘要:

采用多带分解方法研究了拓扑绝缘体(TI)薄膜中巡游电子的动力学行为。我们表明,在2D膜中的电子轨迹是各向异性的,并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联,其可以通过调节膜厚度和/或施加面内磁场来控制。此外,持续的电子波包振荡可以实现在TI薄膜系统中的相变点,这可能有助于在实验检测的抖动运动(Zitterbewegung)。电子运动的微观图像在解释其他与输运相关的效应中的意义,例如,电子介导的RKKY耦合的TI薄膜系统,也进行了讨论。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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