论文标题
通过自旋偏振STM探测的双纳米线中拓扑阶段的传输特征
Transport signatures of topological phases in double nanowires probed by spin-polarized STM
论文作者
论文摘要
我们研究了双纳米线设置接近度，该设置耦合到$ s $ - 波超导体，并搜索拓扑相变的批量特征，例如，可以通过STM尖端观察到这些拓扑相变。在这项工作中研究了三个大量的大量量，即电荷，自旋极化和插图超导的配对幅度。随着系统从微不足道到拓扑阶段的相变，自旋极化和配对振幅翻转符号。为了确定在运输实验中观察相变的大量标志的有前途的方法，我们计算了在局部自旋极化探针之间流动的自旋电流，例如STM尖端，以及Keldysh形式主义中的双纳米线系统。我们发现自旋电流包含有关大体自旋极化的符号翻转的信息，可用于确定拓扑相变点。
We study a double-nanowire setup proximity coupled to an $s$-wave superconductor and search for the bulk signatures of the topological phase transition that can be observed experimentally, for example, with an STM tip. Three bulk quantities, namely, the charge, the spin polarization, and the pairing amplitude of intrawire superconductivity are studied in this work. The spin polarization and the pairing amplitude flip sign as the system undergoes a phase transition from the trivial to the topological phase. In order to identify promising ways to observe bulk signatures of the phase transition in transport experiments, we compute the spin current flowing between a local spin-polarized probe, such as an STM tip, and the double-nanowire system in the Keldysh formalism. We find that the spin current contains information about the sign flip of the bulk spin polarization and can be used to determine the topological phase transition point.
