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arXiv 2102.09096cond-mat.supr-concond-mat.mes-hall
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增强无序两带s波超导体中的长程有序性

Enhancing long-range order in disordered two-band s-wave superconductors

Heron Caldas, S. Rufo, M. A. R. Griffith

AI总结:

本研究针对二维两带s波超导体模型,揭示了反对称杂化可对抗无序对超导性的破坏以维持长程有序,且中强无序下系统会形成具有关联局域序参量的超导岛。

摘要:

我们研究了杂化二维两带s波超导体模型中无序的影响。考虑了如下情形:形成这些能带的电子轨道具有角动量,使得在反演对称性下,轨道间的杂化$V_{i,j}$是反对称的。在位无序由随机杂质势$W$描述。我们发现,随机无序会损害超导性,而杂化则会促进超导性。因此,杂化在两带超导模型中发挥着重要作用,能够在无序增强时维持长程有序。由于杂化可由压力或掺杂诱导,这使得本模型适用于描述真实材料。此外,在中等至强无序区域,系统会分裂为具有关联局域序参量的超导岛。这些关联能延伸至数个晶格间距的距离,对应于超导岛(SC-Islands)的尺寸。

英文摘要:

We investigate the effects of disorder in a hybridized two-dimensional two-band s-wave superconductor model. The situation in which electronic orbitals form these bands with angular momentum such that the hybridization $V_{i,j}$ among them is antisymmetric, under inversion symmetry, was taken into account. The on-site disorder is given by a random impurity potential $W$. We find that while the random disorder acts to the detriment of superconductivity, hybridization proceeds favoring it. Accordingly, hybridization plays an important role in two-band models of superconductivity, in order to hold the long-range order against the increase of disorder. This makes the present model eligible to describe real materials, since the hybridization may be induced by pressure or doping. In addition, the regime from moderate to strong disorder, reveals that the system is broken into superconductor islands with correlated local order parameters. These correlations persist to distances of several order lattice spacing which corresponds to the size of the SC-Islands.

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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