论文标题
高阶拓扑绝缘子中的量化电荷泵
Quantized charge-pumping in higher-order topological insulators
论文作者
论文摘要
我们研究了基于平面磁场和量子自旋霍尔效应的旋转组合，研究具有边缘对应的高阶拓扑绝缘子（HOTIS）的量化电荷泵。在非平衡绿色功能方法的帮助下，发现了特定电荷抽水过程的图片。值得注意的是，我们证明了无需大量状态的情况下实现了量化的电荷泵送电流，并且电荷沿着样品的边界移动。此外，还研究了外部参数对泵送电流的影响。我们发现，可以通过调节导线和样品之间的耦合强度来操纵泵送电流的大小和方向。我们的工作加深了对Hotis电荷泵送的理解，并扩展了对其运输特性的研究。
We study the quantized charge pumping of higher-order topological insulators (HOTIs) with edge-corner correspondences based on the combination of the rotation of in-plane magnetic field and the quantum spin Hall effect. A picture of a specific charge pumping process is uncovered with the help of the non-equilibrium Green's function method. Significantly, we demonstrate that the quantized charge pumping current is achieved without the participation of bulk states, and the charges move along the boundary of the sample. Furthermore, the effects of external parameters on the pumping current is also studied. We find that the magnitude and direction of the pumping current can be manipulated by adjusting the coupling strength between the leads and sample. Our work deepens the understanding of the charge pumping in HOTIs and extends the study of their transport properties.
