Ballistic edge states in Bismuth nanowires revealed by SQUID interferometry.
Ballistic edge states in Bismuth nanowires revealed by SQUID interferometry.
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DOI：
10.1038/ncomms15941
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发表时间：
2017-07-05
影响因子：
16.6
通讯作者：
Guéron S
中科院分区：
文献类型：
--
作者：
Murani A;Kasumov A;Sengupta S;Kasumov YA;Volkov VT;Khodos II;Brisset F;Delagrange R;Chepelianskii A;Deblock R;Bouchiat H;Guéron S
拓扑结构提供的防止后向散射的保护是一个显著的特性。在二维绝缘体中，这种拓扑保护的结果是一维螺旋边缘状态的弹道性质。弹道性的一个证明是量子化的霍尔电导。在这里，我们提供了另一个弹道输运的演示，以边缘态携带超电流的方式。我们研究的系统是一个微米长的单晶铋纳米线，具有拓扑表面，我们将其连接到两个超导电极上。我们测量了流经纳米线的约瑟夫森电流与两端超导相位差之间的关系，即电流-相位关系。我们发现的锯齿状相位调制电流-相位关系表明，沿纳米线的两个弹道边缘有选择性地发生输运。此外，我们证明了磁场诱导0 -π跃迁和φ0结行为，提供了一种方法来操纵携带超电流的边缘态的相位并产生自旋超电流。证明二维拓扑绝缘体中边缘态电流的弹道传导和自旋极化仍然是一个挑战。在这里，Murani等人报告了沿连接到超导电极的铋纳米线的拓扑表面的弹道一维输运的直接特征。
The protection against backscattering provided by topology is a striking property. In two-dimensional insulators, a consequence of this topological protection is the ballistic nature of the one-dimensional helical edge states. One demonstration of ballisticity is the quantized Hall conductance. Here we provide another demonstration of ballistic transport, in the way the edge states carry a supercurrent. The system we have investigated is a micrometre-long monocrystalline bismuth nanowire with topological surfaces, that we connect to two superconducting electrodes. We have measured the relation between the Josephson current flowing through the nanowire and the superconducting phase difference at its ends, the current–phase relation. The sharp sawtooth-shaped phase-modulated current–phase relation we find demonstrates that transport occurs selectively along two ballistic edges of the nanowire. In addition, we show that a magnetic field induces 0–π transitions and φ0-junction behaviour, providing a way to manipulate the phase of the supercurrent-carrying edge states and generate spin supercurrents. Demonstration of ballistic conduction and spin polarization of edge state currents in two dimensional topological insulators remains a challenge. Here, Murani et al. report a direct signature of ballistic one dimensional transport along the topological surfaces of a bismuth nanowire connected to superconducting electrodes.
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