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arXiv 1607.06353cond-mat.supr-concond-mat.mes-hall
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Pb/Co/Si(111)中的二维拓扑超导电性

Two-dimensional topological superconductivity in Pb/Co/Si(111)

Gerbold C. Ménard, Sébastien Guissart, Christophe Brun, Mircea Trif, François Debontridder, Raphël T. Leriche, Dominique Demaille, Dimitri Roditchev, Pascal Simon, Tristan Cren

摘要:

就像绝缘体可以在它们的边缘拥有拓扑狄拉克态一样,超导体也可以表现出以马约拉纳边缘态为特征的拓扑相。近感超导导线两端的零能态被认为是一维拓扑超导体中的定域Majorana端态。相比之下,传播的马约拉纳态应该存在于二维(2D)拓扑超导体的1D边缘。在这里,我们报告了周围的拓扑超导畴由一个单一的原子层的Pb覆盖Co/Si(111)的磁性岛的色散间隙状态的直接观察。我们解释了所观察到的连续分散在超导能隙的空间拓扑转变伴随着手征边缘模式和剩余的间隙螺旋边缘状态。我们的实验方法使工程和控制各种各样的新的量子相位。这在量子材料和量子电子学领域开辟了新的视野,其中畴的磁化强度可以用作操纵拓扑状态的控制参数。

英文摘要:

Just like insulators can host topological Dirac states at their edges, superconductors can also exhibit topological phases characterized by Majorana edge states. Remarkable zero-energy states have been recently observed at the two ends of proximity induced superconducting wires, and were interpreted as localized Majorana end states in one-dimensional (1D) topological superconductor. By contrast, propagating Majorana states should exist at the 1D edges of two-dimensional (2D) topological superconductors. Here we report the direct observation of dispersive in-gap states surrounding topological superconducting domains made of a single atomic layer of Pb covering magnetic islands of Co/Si(111). We interpret the observed continuous dispersion across the superconducting gap in terms of a spatial topological transition accompanied by a chiral edge mode and residual gaped helical edge states. Our experimental approach enables the engineering and control of a large variety of novel quantum phases. This opens new horizons in the field of quantum materials and quantum electronics where the magnetization of the domains could be used as a control parameter for the manipulation of topological states.

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