SQUID干涉法研究铋纳米线的弹道边缘态
Ballistic edge states in Bismuth nanowires revealed by SQUID interferometry
摘要：
自旋-轨道相互作用对重元素基材料的能带结构具有显著的影响。著名的例子是最近发现的3D和2D拓扑绝缘体。在这些系统中，输运发生在表面或沿边缘，并且自旋动量锁定提供了对（非磁性）杂质散射的保护，有利于自旋极化的弹道输运。我们已经使用了一个微米长的单晶铋纳米线连接到超导电极的电流相位关系的测量，以证明运输发生弹道沿这种高自旋轨道材料的两个边缘。此外，我们表明，一个磁场可以诱导0 π跃迁和phi 0结的行为，由于在这个系统中的非常高的g-因子和自旋轨道耦合，提供了一种方法来操纵的超导载流边缘状态的相位。
英文摘要：
Spin-orbit interactions are known to have drastic effects on the band structure of heavy-element-based materials. Celebrated examples are the recently identified 3D and 2D topological insulators. In those systems transport takes place at surfaces or along edges, and spin-momentum locking provides protection against (non-magnetic) impurity scattering, favoring spin-polarized ballistic transport. We have used the measurement of the current phase relation of a micrometer-long single crystal bismuth nanowire connected to superconducting electrodes, to demonstrate that transport occurs ballistically along two edges of this high-spin-orbit material. In addition, we show that a magnetic field can induce to 0-pi transitions and phi0-junction behavior, thanks to the extraordinarily high g-factor and spin orbit coupling in this system, providing a way to manipulate the phase of the supercurrent-carrying edge states.
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