砷化铟中通过平凡边缘态的超导量子干涉。

h/e Superconducting Quantum Interference through Trivial Edge States in InAs.

机构信息

QuTech and Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands.

Instituut-Lorentz, Universiteit Leiden, P.O. Box 9506, 2300 RA Leiden, The Netherlands.

出版信息

Phys Rev Lett. 2018 Jan 26;120(4):047702. doi: 10.1103/PhysRevLett.120.047702.

DOI:10.1103/PhysRevLett.120.047702

PMID:29437430

Abstract

Josephson junctions defined in strong spin orbit semiconductors are highly interesting for the search for topological systems. However, next to topological edge states that emerge in a sufficient magnetic field, trivial edge states can also occur. We study the trivial edge states with superconducting quantum interference measurements on nontopological InAs Josephson junctions. We observe a SQUID pattern, an indication of superconducting edge transport. Also, a remarkable h/e SQUID signal is observed that, as we find, stems from crossed Andreev states.

摘要

在强自旋轨道半导体中定义的约瑟夫森结对于寻找拓扑系统非常有趣。然而，除了在足够强磁场下出现的拓扑边缘态之外，也可能出现平凡的边缘态。我们通过对非拓扑 InAs 约瑟夫森结进行超导量子干涉测量来研究平凡的边缘态。我们观察到了 SQUID 模式，这是超导边缘输运的一个迹象。此外，我们还观察到了一个显著的 h/e SQUID 信号，正如我们发现的那样，它源自交叉的安德烈夫态。