Anomalous Josephson current in quantum anomalous Hall insulator-based superconducting junctions with a domain wall structure

doi:10.1088/1674-1056/aba272

Abstract We theoretically study the Josephson effect in a quantum anomalous Hall insulator (QAHI) nanoribbon with a domain wall structure and covered by the superconductor. The anomalous Josephson current, the nonzero supercurrent at the zero superconducting phase difference, appears with the nonzero magnetization and the suitable azimuth angle of the domain wall. Dependent on the configuration of the domain wall, the anomalous current peaks in the Bloch type but disappears in the Néel type because the y-component of magnetization is necessary to break symmetry to arouse the anomalous current. The phase shift of the anomalous current is tunable by the magnetization, the azimuth angle, or the thickness of the domain wall. By introducing a bare QAHI region in the middle of the junction which is not covered by the superconductor, the anomalous Josephson effect is enhanced such that the phase shift can exceed π. Thus, a continuous change between 0 and π junctions is realized via regulating the configuration of the domain wall or the magnetization strength. As long as an s-wave superconductor is placed on the top of the QAHI with a domain wall structure, this proposal can be experimentally fabricated and useful for the phase battery or superconducting quantum bit.

Keywords: anomalous Josephson current quantum anomalous Hall insulator domain wall Josephson junction

Received: 08 May 2020
Revised: 20 June 2020
Accepted manuscript online: 03 July 2020

PACS:	74.45.+c	(Proximity effects; Andreev reflection; SN and SNS junctions)
	75.60.Ch	(Domain walls and domain structure)
	73.23.-b	(Electronic transport in mesoscopic systems)

Fund: Project supported by the National Key R&D Program of China (Grant No. 2017YFA0303301), the National Natural Science Foundation of China (Grant Nos. 11921005 and 11574007), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB28000000), and Beijing Municipal Science & Technology Commission, China (Grant No. Z191100007219013).

Corresponding Authors: Qing-Feng Sun
E-mail: sunqf@pku.edu.cn

Cite this article:

Qing Yan(闫青), Yan-Feng Zhou(周彦峰), Qing-Feng Sun(孙庆丰) Anomalous Josephson current in quantum anomalous Hall insulator-based superconducting junctions with a domain wall structure 2020 Chin. Phys. B 29 097401

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Anomalous Josephson current in quantum anomalous Hall insulator-based superconducting junctions with a domain wall structure

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