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Abstract
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 d x 2−y 2 magnetization symmetry can support a JDE whereas the dxy 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.
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