Non-reciprocal electronic transport in a material occurs if both time reversal and inversion symmetries are broken. The superconducting diode effect (SDE) is an exotic manifestation of this type of behavior where the critical current for positive and negative currents are mismatched, as recently observed in some non-centrosymmetric superconductors with a magnetic field. Here, we demonstrate a SDE in non-magnetic Nb/Ru/Sr₂RuO₄ Josephson junctions without applying an external magnetic field. The cooling history dependence of the SDE suggests that time-reversal symmetry is intrinsically broken by the superconducting phase of Sr₂RuO₄. Applied magnetic fields modify the SDE dynamically by randomly changing the sign of the non-reciprocity. We propose a model for such a topological junction with a conventional superconductor surrounded by a chiral superconductor with broken time reversal symmetry.

如果时间反转和反演对称性都被打破，材料中就会发生非互易电子传输。超导二极管效应 (SDE) 是此类行为的一种奇特表现，其中正负电流的临界电流不匹配，正如最近在一些具有磁场的非中心对称超导体中观察到的那样。在这里，我们在不施加外部磁场的情况下演示了非磁性 Nb/Ru/Sr ₂ RuO _{4约瑟夫森结中的 SDE。}SDE 的冷却历史依赖性表明，Sr ₂ RuO ₄的超导相本质上破坏了时间反演对称性。施加的磁场通过随机改变不可逆性的符号来动态修改 SDE。我们提出了一种这种拓扑结的模型，其中传统超导体被时间反转对称性破缺的手性超导体包围。