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arXiv 1507.05904cond-mat.supr-concond-mat.mes-hall
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拓扑超导体中吸附杂质周围的边缘态和局域电子结构

Edge states and local electronic structure around an adsorbed impurity in a topological superconductor

Yuan-Yen Tai, Hongchul Choi, Towfiq Ahmed, C. S. Ting, Jian-Xin Zhu

摘要:

近年来,拓扑超导态引起了人们极大的兴趣。在本工作中,我们考虑了一个具有$Z_2$拓扑镜像序[1]和s $\pm$ -波超导配对对称性的拓扑超导体,在最初为铁基超导性设计的双轨道模型[2]中。我们预言了无带隙边缘态的存在。我们还研究了系统中吸附的间隙磁性杂质周围的局域电子结构,发现即使杂质上有弱的自旋极化,也存在低能的带隙束缚态。我们还讨论了我们的结果的相关性,最近的STM实验的Fe(Te,Se)化合物与吸附的Fe杂质[3],我们的密度泛函计算表明,Fe杂质是自旋极化。

英文摘要:

Recently topological superconducting states has attracted a lot of interest. In this work, we consider a topo- logical superconductor with $Z_2$ topological mirror order [1] and s$\pm$-wave superconducting pairing symmetry, within a two-orbital model originally designed for iron-based superconductivity [2]. We predict the existence of gapless edge states. We also study the local electronic structure around an adsorbed interstitial magnetic impurity in the system, and find the existence of low-energy in-gap bound states even with a weak spin polar- ization on the impurity. We also discuss the relevance of our results to the recent STM experiment on Fe(Te,Se) compound with adsorbed Fe impurity [3], for which our density functional calculations show the Fe impurity is spin polarized.

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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