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arXiv 1902.09014cond-mat.supr-con
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电压偏置邻近系统中的顺磁迈斯纳效应

Paramagnetic Meissner effect in voltage-biased proximity systems

Jabir Ali Ouassou, Wolfgang Belzig, Jacob Linder

摘要:

传统的超导体通过产生抗磁屏蔽电流来响应外部磁场。然而,理论工作表明,人们可以设计出屏蔽电流是顺磁性的系统,使它们吸引磁通量--这一预测最近得到了实验验证。与以前的研究相比,我们表明,这种效果可以实现在简单的超导体/正常金属结构,没有特殊的属性,只使用一个简单的电压偏置驱动系统的平衡。这是一个非常重要的问题,因为它开辟了一条新的研究途径,同时也突出了人们如何在费米能级上实现顺磁迈斯纳效应而不需要奇频态。此外,在这样一个简单的系统中的电压可调的电磁响应可能是有趣的未来的设备设计。

英文摘要:

Conventional superconductors respond to external magnetic fields by generating diamagnetic screening currents. However, theoretical work has shown that one can engineer systems where the screening current is paramagnetic, causing them to attract magnetic flux -- a prediction that has recently been experimentally verified. In contrast to previous studies, we show that this effect can be realized in simple superconductor/normal-metal structures with no special properties, using only a simple voltage bias to drive the system out of equilibrium. This is of fundamental interest, since it opens up a new avenue of research, and at the same time highlights how one can realize paramagnetic Meissner effects without having odd-frequency states at the Fermi level. Moreover, a voltage-tunable electromagnetic response in such a simple system may be interesting for future device design.

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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