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

doi:10.1088/1674-1056/add7aa

中国物理B ›› 2025, Vol. 34 ›› Issue (10): 107803-107803.doi: 10.1088/1674-1056/add7aa

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

Yi Jiang(蒋易), Han-Lin Liu(刘翰林)†, and Jun Wang(汪军)

School of Physics, Southeast University, Nanjing 210096, China

收稿日期:2025-03-18 修回日期:2025-05-09 接受日期:2025-05-13 发布日期:2025-10-11
通讯作者: Han-Lin Liu E-mail:hanlinl@seu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 12174051) and the Fundamental Research Funds for Central Universities.

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

Yi Jiang(蒋易), Han-Lin Liu(刘翰林)†, and Jun Wang(汪军)

School of Physics, Southeast University, Nanjing 210096, China

Received:2025-03-18 Revised:2025-05-09 Accepted:2025-05-13 Published:2025-10-11
Contact: Han-Lin Liu E-mail:hanlinl@seu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 12174051) and the Fundamental Research Funds for Central Universities.

摘要/Abstract

摘要： 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.

关键词: Josephson diode effect, altermagnet, d-wave magnetization, Rashba spin-orbit interaction

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.

Key words: Josephson diode effect, altermagnet, d-wave magnetization, Rashba spin-orbit interaction

中图分类号: (Electro-optical effects)

78.20.Jq

71.70.Fk (Strain-induced splitting) 72.80.Vp (Electronic transport in graphene)

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[J]. 中国物理B, 2025, 34(10): 107803-107803.

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[J]. Chin. Phys. B, 2025, 34(10): 107803-107803.

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

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

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