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arXiv 1607.04150cond-mat.supr-con
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Witten效应引起的约瑟夫森电流

Josephson currents induced by the Witten effect

Flavio S. Nogueira, Zohar Nussinov, Jeroen van den Brink

摘要:

我们揭示了一种新型的拓扑约瑟夫森效应的存在,涉及II型超导体和三维拓扑绝缘体作为隧道结。我们预测,涡线诱导威滕效应的一个变体,这是拓扑绝缘体的轴子电磁响应的后果:在交界处的界面处,每个通量量子获得e/4的分数电荷。因此,如果垂直于结施加外部磁场,则威滕效应在没有任何外部电压的情况下感应AC约瑟夫森效应。我们推导出一些进一步的实验结果,并提出潜在的设置,这些{量子化,通量诱导,威滕}效应可能会被观察到。

英文摘要:

We reveal the existence of a new type of topological Josephson effect involving type II superconductors and three-dimensional topological insulators as tunnel junctions. We predict that vortex lines induce a variant of the Witten effect that is the consequence of the axion electromagnetic response of the topological insulator: at the interface of the junction each flux quantum attains a fractional electrical charge of e/4. As a consequence, if an external magnetic field is applied perpendicular to the junction, the Witten effect induces an AC Josephson effect in absence of any external voltage. We derive a number of further experimental consequences and propose potential setups where these {quantized, flux induced, Witten} effects may be observed.

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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