Spontaneous superconducting diode effect in non-magnetic Nb/Ru/Sr2RuO4 topological junctions
Spontaneous superconducting diode effect in non-magnetic Nb/Ru/Sr2RuO4 topological junctions
复制标题
非磁性 Nb/Ru/Sr2RuO4 拓扑结中的自发超导二极管效应
DOI：
10.1038/s42005-023-01409-4
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发表时间：
2023
影响因子：
5.5
通讯作者：
Anwar M
中科院分区：
文献类型：
--
作者：
Anwar M
如果时间反转和反转对称性都被破坏，则材料中的非互易电子输运发生。超导二极管效应（英语：Superconducting diode effect）是这种行为的奇异表现，其中正负电流的临界电流不匹配，最近在一些具有磁场的非中心对称超导体中观察到。在这里，我们证明了一个在无磁性的Nb/Ru/Sr 2 RuO 4约瑟夫森结，而不施加外磁场的超导。的冷却历史依赖的Sr 2 RuO 4表明，时间反演对称性本质上是由超导相打破。施加的磁场通过随机改变非互易性的符号来动态地修改磁阻。我们提出了一个模型，这样的拓扑结与传统的超导体周围的手征超导体的时间反演对称性破缺。
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/Sr2RuO4Josephson 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.