可逆的无场超导二极管效应由反铁磁体控制
Reversible field-free superconducting diode effect controlled by an antiferromagnet
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中文总结 AI 辅助
本研究在传统超导铝与反铁磁CuMnAs邻近的体系中实现了无外场超导二极管效应，通过调节邻近效应和关联Néel态反转，证明无需自旋劈裂或净磁化即可实现磁控非互易超导，扩展了超导非互易性的材料范围。
中文摘要 AI 辅助
半导体二极管允许电流优先在一个方向流动，是众多现代电子电路的基本构建模块。其超导对应物——超导二极管效应——实现了无耗散的方向性电流流动，并可能在未来的超导量子电路中提供类似功能。实现这种非互易超电流需要打破时间反演对称性。在零外加磁场下，这通常与内在的非传统超导性或由磁邻近效应诱导的外在自旋劈裂电子态相关。在这里，我们展示了在传统超导Al中，通过共线反铁磁CuMnAs的邻近效应实现的无场超导二极管效应，其电子结构在不产生自旋劈裂的情况下打破了时间反演对称性。通过绝缘AlAs插入层调节邻近效应，并将二极管极性的反转与剩余Néel态的反转相关联，我们确立了反铁磁体控制超导二极管效应。我们的结果表明，对于磁控无场超导二极管效应，既不需要自旋劈裂能带，也不需要净磁化，从而将超导非互易性扩展到更广泛的共线补偿磁体类别。
英文摘要
The semiconductor diode, which allows current to flow preferentially in one direction, is a fundamental building block of numerous modern electronic circuits. Its superconducting analogue---the superconducting diode effect---enables directional dissipationless current flow and may provide similar functionality in future superconducting quantum circuits. Realization of such a nonreciprocal supercurrent requires broken time-reversal symmetry. At zero applied field, this has been typically associated either with intrinsic unconventional superconductivity or extrinsic spin-split electronic states induced by magnetic proximity. Here we demonstrate a field-free superconducting diode effect in conventional superconducting Al proximitized by collinear antiferromagnetic CuMnAs, whose electronic structure breaks time-reversal symmetry without generating spin splitting. By tuning the proximity effect through an insulating AlAs interlayer and correlating the reversal of the diode polarity with the reversal of the remanent Néel state, we establish that the antiferromagnet controls the superconducting diode effect. Our results show that neither spin-split bands nor net magnetization is required for a magnetically controlled field-free superconducting diode effect, extending superconducting nonreciprocity to a broader class of collinear compensated magnets.
发表机构
- Institute of Physics, Czech Academy of Sciences（捷克科学院物理研究所）
- Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague（布拉格捷克理工大学核科学与物理工程学院）
- Niels Bohr Institute, University of Copenhagen（哥本哈根大学尼尔斯·玻尔研究所）
- Faculty of Mathematics and Physics, Charles University（查理大学数学与物理学院）
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