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arXiv 1111.5674cond-mat.supr-con
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拓扑有序超导体中的杂质诱导束缚态

Impurity-induced bound states in superconductors with topological order

Fei Wang, Qin Liu, Tianxing Ma, Xunya Jiang

摘要:

拓扑绝缘体中经典自旋的研究[Phys. Rev. B { \bf 80},115216(2009)]被推广到拓扑超导体。基于所谓的$F$ -函数的特征,将超导体的Bogoliubov-de Gennes哈密顿量分为拓扑超导体和BCS超导体的正、负和零“能隙”类,分别对应于拓扑超导体的拓扑平凡相和非平凡相.发现$F$函数直接决定了超导能隙中由体经典自旋和超导杂质诱导的局域激发态的存在与否及其与杂质强度的关系。我们的研究结果提供了一种替代的方法来识别拓扑绝缘和超导相在实验中,而不诉诸于表面性质。

英文摘要:

The study of classical spins in topological insulators [Phys. Rev. B {\bf 80}, 115216 (2009)] is generalized to topological superconductors. Based on the characteristic features of the so-called $F$-function, Bogoliubov-de Gennes Hamiltonian for superconductors is classified to positive, negative, and zero "gap" categories for topologically trivial and nontrivial phases of a topological superconductor as well as a BCS superconductor respectively. It is found that the $F$-function determines directly the presence or absence of localized excited states, induced by bulk classical spins and nonmagnetic impurities, in superconducting gap and their persistence with respect to impurity strength. Our results provide an alternative way to identify topologically insulating and superconducting phases in experiments while without resorting to the surface properties.

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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