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arXiv 2203.15801cond-mat.supr-con
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超导体的电流使能光导性

Current-enabled optical conductivity of superconductors

Michał Papaj, Joel E. Moore

摘要:

在大多数超导体中,光激发需要杂质散射或多个能带的存在。这是因为在干净的单带超导体中,粒子-空穴和反转对称性的结合阻止了动量守恒跃迁。在这项工作中,我们展示了如何超导的流动可以导致新的贡献,光学电导率。由于超导电流打破了反转对称性,即使在干净的超导体中,也允许跨越超导能隙的跃迁,并且在与能隙宽度相当的能量中,超导能隙的跃迁超过了杂质引起的贡献。的响应是依赖于基本的正常状态的性质,以及对超导秩序的类型。通过使用由外部磁场产生的具有可控大小和方向的屏蔽超电流,这使得能够详细研究非常规超导体中的超导状态和可能的间隙对称性确定,对于这些超导体,其他技术还不可行。

英文摘要:

In most superconductors, optical excitations require impurity scattering or the presence of multiple bands. This is because in clean single-band superconductors, the combination of particle-hole and inversion symmetries prevents momentum-conserving transitions. In this work we show how the flow of supercurrent can lead to new contributions to optical conductivity. As supercurrent breaks inversion symmetry, transitions across the superconducting gap become allowed even in clean superconductors and dominate over impurity-induced contributions for energies comparable to the gap width. The response is dependent on the nature of the underlying normal state as well as on the type of superconducting order. Through use of the screening supercurrent with controllable magnitude and direction, that arises from an external magnetic field, this enables a detailed investigation of the superconducting state and possible gap symmetry determination in unconventional superconductors for which other techniques have not been practicable.

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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