We propose the superconducting diode effect (SDE) in a planar $s$-wave/$d$-wave/$s$-wave Josephson junction as a direct phase-sensitive probe of the $d$-wave pairing function in high-$T_c$ superconductors. Asymmetric interface coupling breaks inversion symmetry and induces a spontaneous $\pm \pi /2$ phase difference, thereby breaking time-reversal symmetry without a magnetic field. In this TRS-broken state, the SDE emerges when single-Cooper-pair tunneling is enabled at the s-d interfaces, with its polarity and efficiency controllable by rotating the $d$-wave crystallographic orientation or perturbing its intrinsic $C_4$ symmetry. Our results reveal a robust link between nonreciprocal Josephson transport and pairing symmetry, demonstrating the SDE as a powerful diagnostic tool for high-$T_c$ superconductors and a tunable element for superconducting electronics.

Close

PrevNext

View figure in article

• Andreev bound states
• Critical current
• Josephson effect
• d-wave
• Diodes
• High-temperature superconductors
• Josephson junctions
• Superconducting devices
• Unconventional superconductors
• Tight-binding model