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arXiv 1806.07906cond-mat.mes-hallcond-mat.supr-con
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超导体中涡旋液体介导的非定域自旋输运

Nonlocal Spin Transport Mediated by a Vortex Liquid in Superconductors

Se Kwon Kim, Roberto Myers, Yaroslav Tserkovnyak

摘要:

从传统的观点出发,超导涡旋作为一个寄生源的耗散电荷输运,我们建议使用移动涡旋作为拓扑稳定的信息载体自旋输运。为此,我们首先构建了一个唯象理论自旋和涡旋之间的相互转换,一个拓扑电荷携带的涡旋,在磁绝缘体和超导体之间的界面,通过调用界面自旋霍尔效应。然后,我们表明,在超导体中的涡旋液体可以作为两个磁性绝缘体之间的自旋输运通道编码的涡旋信息。两个磁性绝缘体之间的涡旋介导的非局部信号被示出为代数衰减作为它们的分离的函数,与准粒子介导的自旋输运的指数衰减形成对比。我们设想,流体动力学的拓扑激发,如超导体中的涡旋和磁体中的畴壁,可以作为一个通用的框架来讨论有序材料的长程输运性质。

英文摘要:

Departing from the conventional view on superconducting vortices as a parasitic source of dissipation for charge transport, we propose to use mobile vortices as topologically-stable information carriers for spin transport. To this end, we start by constructing a phenomenological theory for the interconversion between spin and vorticity, a topological charge carried by vortices, at the interface between a magnetic insulator and a superconductor, by invoking the interfacial spin Hall effect therein. We then show that a vortex liquid in superconductors can serve as a spin-transport channel between two magnetic insulators by encoding spin information in the vorticity. The vortex-mediated nonlocal signal between the two magnetic insulators is shown to decay algebraically as a function of their separation, contrasting with the exponential decay of the quasiparticle-mediated spin transport. We envision that hydrodynamics of topological excitations, such as vortices in superconductors and domain walls in magnets, may serve as a universal framework to discuss long-range transport properties of ordered materials.

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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