Josephson diode effect in altermagnet-based s-wave superconductor junction

doi:10.1088/1674-1056/add7aa

Abstract We investigate the possible Josephson diode effect (JDE) in a two-dimensional (2D) nonmagnetic planar s-wave superconductor junction, which is constructed on a spin-collinear d-wave altermagnet (AM) material in the presence of Rashba spin-orbit interaction. It is demonstrated that the JDE is critically dependent on the crystalline axis of the AM relative to the current direction. The ${\rm d}_{x^2-y^2}$ magnetization symmetry can support a JDE whereas the ${\rm d}_{xy}$ symmetry does not facilitate it. The JDE efficiency can reach up to $40%$ and can be adjusted by an additional asymmetric gate voltage applied to the non-superconducting region of the junction, including control of its polarity. Our findings provide an electrical means to control the JDE within a non-magnetic AM-based superconducting junction.

Keywords: Josephson diode effect altermagnet d-wave magnetization Rashba spin-orbit interaction

Received: 18 March 2025
Revised: 09 May 2025
Accepted manuscript online: 13 May 2025

PACS:	78.20.Jq	(Electro-optical effects)
	71.70.Fk	(Strain-induced splitting)
	72.80.Vp	(Electronic transport in graphene)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 12174051) and the Fundamental Research Funds for Central Universities.

Corresponding Authors: Han-Lin Liu
E-mail: hanlinl@seu.edu.cn

Cite this article:

Yi Jiang(蒋易), Han-Lin Liu(刘翰林), and Jun Wang(汪军) Josephson diode effect in altermagnet-based s-wave superconductor junction 2025 Chin. Phys. B 34 107803

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