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$\phi_0$-junction and Josephson diode effect in high-temperature superconductor

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arxiv 2410.06838 v1 pith:OZJ7FLNK submitted 2024-10-09 cond-mat.supr-con quant-ph

classification cond-mat.supr-conquant-ph
keywords symmetryjunctionbreakinghigh-temperatured-wavediodejosephsons-wave
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

Motivated by recent progress in both the Josephson diode effect (JDE) and the high-temperature Josephson junction, we propose to realize the JDE in an s-wave/d-wave/s-wave (s-d-s) superconductor junction and investigate the high-temperature superconducting order parameters. The interlayer coupling between s-wave and d-wave superconductors can induce an effective $d+is$ superconducting state, spontaneously breaking time-reversal symmetry. The asymmetric s-d interlayer couplings break the inversion symmetry. Remarkably, the breaking of these two symmetries leads to a $\phi_0$-junction but does not generate JDE. We find that the emergence of the JDE in this junction depends on the $C_4$ rotational symmetry of the system. Although breaking $C_4$ rotational symmetry does not affect time-reversal and inversion symmetries, it can control the magnitude and polarity of diode efficiency. Furthermore, we propose observing C$_{4}$ symmetry breaking controlled JDE through asymmetric Shapiro steps. Our work suggests a JDE mechanism that relies on high-temperature d-wave pairing, which could inversely contribute to a potential experimental method for detecting the unconventional pairing symmetry in superconductors.

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  1. Edge dependent Josephson Diode effect in WTe$_{2}$-Based Josephson junction

    cond-mat.supr-con 2025-08 conditional novelty 6.0 of 10

    Edge termination asymmetry in WTe2 nanoribbons produces a magnetic-flux-tunable Josephson diode effect, boosted above 50% efficiency by admixing bulk transport channels.

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