Phase-sensitive non-reciprocal transport in high-temperature superconductor

Abstract

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-Tc superconductors. Asymmetric interface coupling breaks inversion symmetry and induces a spontaneous 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 C4 symmetry. Our results reveal a robust link between nonreciprocal Josephson transport and pairing symmetry, establishing the SDE as a powerful diagnostic tool for high-Tc superconductors and a tunable element for superconducting electronics.

6 pages, 4 figures,

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