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arXiv 2107.08012cond-mat.supr-con
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电子-声子超导体中的动力学涡旋

Dynamical vortices in electron-phonon superconductors

Morten H. Christensen, Andrey V. Chubukov

摘要:

本文分析了电子-声子相互吸引和电子-电子相互排斥系统中$s-$波超导能隙的结构。早期的研究发现,尽管有很强的排斥力,超导性仍会发展,但能隙$Δ(ω_m)$必然会沿着松原轴改变符号。利用$Δ(ω_m)$的节点是动力学涡旋中心的知识,从拓扑学的角度分析了变号间隙函数。我们考虑两种模型与不同的截止排斥相互作用和跟踪的旋涡位置沿松原轴和上频率半平面后,改变的相互作用的吸引力和排斥力的部分的相对强度。我们讨论了动态涡旋的存在如何影响沿实轴的间隙结构,在ARPES实验检测。

英文摘要:

We analyze the structure of an $s-$wave superconducting gap in systems with electron-phonon attraction and electron-electron repulsion. Earlier works have found that superconductivity develops despite strong repulsion, but the gap, $Δ(ω_m)$, necessarily changes sign along the Matsubara axis. We analyze the sign-changing gap function from a topological perspective using the knowledge that a nodal point of $Δ(ω_m)$ is the center of dynamical vortex. We consider two models with different cutoffs for the repulsive interaction and trace the vortex positions along the Matsubara axis and in the upper frequency half plane upon changing the relative strength of the attractive and repulsive parts of the interaction. We discuss how the presence of dynamical vortices affects the gap structure along the real axis, detectable in ARPES experiments.

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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