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arXiv 2212.09211cond-mat.supr-con
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无序系统中的本征超导二极管效应

Intrinsic superconducting diode effect in disordered systems

Yuhei Ikeda, Akito Daido, Youichi Yanase

摘要:

非互易输运现象在现代凝聚态物理中引起了广泛的关注。在超导领域,超导二极管效应一直是人们研究的热点问题之一。最近对螺旋内禀机制的理论研究揭示了螺旋超导与螺旋超导之间的关系,这一点尚待实验澄清。本文建立了无序系统内禀电子的微观理论。我们发现,在中等杂质浓度下,非互易临界电流的符号反转被抑制。然而,即使在适度无序的区域,超导体也显示出一个特征,标志着螺旋超导性质的变化。研究还发现,二极管的品质因数$r$增加的障碍,并达到20%的Rashba-Zeeman模型。

英文摘要:

Nonreciprocal transport phenomena have attracted much attention in modern condensed matter physics. In the field of superconductivity, the superconducting diode effect (SDE) has been one of the central topics. Recent theoretical studies for the SDE in intrinsic mechanism revealed the relation between the SDE and helical superconductivity, for which experimental clarification has been awaited. In this work, we establish a microscopic theory of the intrinsic SDE in disordered systems. We show that the sign reversal of the nonreciprocal critical current is suppressed under moderate impurity concentrations. However, even in the moderately disordered region, the SDE shows a feature signaling the change in the nature of helical superconductivity. It is also found that the diode quality factor $r$ is increased by disorders and reaches 20% in the Rashba-Zeeman model.

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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