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arXiv 2407.14852cond-mat.supr-concond-mat.mes-hall
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竞争性螺旋能带与 F/S/TI/S/F 混合结构中的高效二极管效应

Competitive helical bands and highly efficient diode effect in F/S/TI/S/F hybrid structures

T. Karabassov, I. V. Bobkova, V. S. Stolyarov, V. M. Silkin, A. S. Vasenko

AI总结:

本文提出了一种基于三维拓扑绝缘体上双铁磁超导岛的 F/S/TI/S/F 介观器件,通过调节单岛磁化控制超导二极管效率符号,并利用螺旋能带竞争贡献实现效率大幅提升。

摘要:

近年来,超导材料中的二极管效应得到了积极研究。人们提出了许多不同的器件作为观察超导二极管效应的平台。在本工作中,我们讨论了设计具有可控极性的高效超导二极管的可能性。我们提出了一种介观器件,由两个分离的、具有邻近诱导铁磁性的超导岛组成,沉积在三维拓扑绝缘体表面。利用 Usadel 方程的准经典形式,我们证明了二极管效率的符号可以通过调节单个超导岛的磁化强度来控制。此外,我们展示了在此类器件中,二极管效率可以得到显著提升。我们认为,二极管效率的显著提升归因于两个超导岛对超流的竞争性贡献,这些超流通过拓扑绝缘体表面的单一螺旋能带相互连接。

英文摘要:

The diode effect in superconducting materials has been actively investigated in recent years. Plenty of different devices have been proposed as a platform to observe the superconducting diode effect. In this work we discuss the possibility of a highly efficient superconducting diode design with controllable polarity. We propose the mesoscopic device that consists of two separated superconducting islands with proximity induced ferromagnetism deposited on top of the three-dimensional topological insulator. Using the quasiclassical formalism of the Usadel equations we demonstrate that the sign of the diode efficiency can be controlled by magnetization tuning of a single superconducting island. Moreover, we show that the diode efficiency can be substantially increased in such device. We argue that the dramatic increase of the diode efficiency is due to competing contribution of the two superconducting islands to the supercurrent with single helical bands linked through the topological insulator surface.

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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