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arXiv 1503.03500cond-mat.supr-con
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自旋轨道耦合下$π$偏置约瑟夫森结中的巨三重态邻近效应

Giant Triplet Proximity Effect in $π$-biased Josephson Junctions with Spin-Orbit Coupling

Sol Jacobsen, Jacob Linder

摘要:

在扩散约瑟夫森结中,超导体之间的相位差$ϕ$强烈地影响着分离它们的层的光谱特征。直到最近才有实验报道了对均匀小间隙及其相位调制的观测,证明了与迄今为止的理论预测一致--在$ϕ=π$处消失的小间隙。值得注意的是,我们发现,在存在固有的自旋-轨道耦合的一个巨大的邻近效应,由于自旋三重态库珀对可以在$ϕ=π$开发,在完全相反的抑制邻近效应没有自旋-轨道耦合。在这里,我们报告了这种效果的数值和分析相结合的研究,证明其存在完全基于对称性参数,这使得它独立于实验中使用的具体参数。我们表明,三重态的光谱签名是存在于整个铁磁层。我们的发现为人工创造、控制和分离自旋三重态超导性提供了一种新的方法。

英文摘要:

In diffusive Josephson junctions the phase-difference $ϕ$ between the superconductors strongly influences the spectroscopic features of the layer separating them. The observation of a uniform minigap and its phase modulation were only recently experimentally reported, demonstrating agreement with theoretical predictions up to now - a vanishing minigap at $ϕ=π$. Remarkably, we find that in the presence of intrinsic spin-orbit coupling a giant proximity effect due to spin-triplet Cooper pairs can develop at $ϕ=π$, in complete contrast to the suppressed proximity effect without spin-orbit coupling. We here report a combined numerical and analytical study of this effect, proving its presence solely based on symmetry arguments, which makes it independent of the specific parameters used in experiments. We show that the spectroscopic signature of the triplets is present throughout the entire ferromagnetic layer. Our finding offers a new way to artificially create, control and isolate spin-triplet superconductivity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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