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arXiv 2501.12908cond-mat.mes-hallcond-mat.supr-conhep-th
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超导体-陈绝缘体界面处的分数电荷涡旋

Fractionally Charged Vortices at Superconductor-Chern Insulator Interfaces

University of Luxembourg(卢森堡大学)

Enderalp Yakaboylu, Thomas L. Schmidt

AI总结:

研究超导体-陈绝缘体异质结构界面涡旋物理,通过有效(2+1)维理论揭示界面库珀对自由度由两个耦合阿贝尔-霍金场通过陈-西蒙斯项相互作用,导致涡旋带分数电荷e/2和拓扑质量,预测拓扑阿布里科索夫晶格新物相。

摘要:

我们研究由II型s波超导体(SC)和C=1陈绝缘体(CI)组成的异质结构界面涡旋物理。通过推导有效(2+1)维理论,我们表明界面库珀对自由度由两个耦合阿贝尔-霍金场通过继承自CI的陈-西蒙斯项相互作用描述。这种相互作用使光子场获得拓扑质量,并在涡旋上诱导分数电荷e/2。拓扑质量根本重塑界面涡旋晶格,而分数电荷导致独特的四涡旋束缚簇形成。因此,我们预测一种拓扑阿布里科索夫晶格,确立SC-CI界面的新物相。

英文摘要:

We investigate the interfacial vortex physics of a heterostructure composed of a type-II $s$-wave superconductor (SC) and a $C=1$ Chern insulator (CI). By deriving an effective $(2+1)$-dimensional theory, we show that the interfacial Cooper-pair degrees of freedom are described by two coupled Abelian-Higgs fields interacting via a Chern-Simons term inherited from the CI. This interaction endows the photon field with a topological mass and induces a \emph{fractional} electric charge of $e/2$ on the vortices. The topological mass fundamentally reshapes the interfacial vortex lattice, while the fractional charge leads to the formation of unique four-vortex bound clusters. We thus predict a \emph{topological Abrikosov lattice}, establishing a novel phase of matter at the SC-CI interface.

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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