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arXiv 1901.03120cond-mat.supr-con
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铁基超导体中的拓扑涡旋相变

Topological Vortex Phase Transitions in Iron-Based Superconductors

Shengshan Qin, Lunhui Hu, Xianxin Wu, Xia Dai, Chen Fang, Fu-chun Zhang, Jiangping Hu

摘要:

我们研究铁基超导体中的拓扑涡旋相。除了先前已知的涡旋端Majorana零模(MZMs)相位源于存在一个三维(3D)强拓扑绝缘体状态,我们表明,有另一个拓扑非平凡的阶段,铁基超导体可以掺杂超导3D弱拓扑绝缘体(WTI)。超导三维WTI中的涡旋束缚态表现出两种不同的量子态,一种是具有体MZM对的健壮节超导相,另一种是在一定掺杂水平范围内具有单涡旋端MZM的全能隙拓扑非平凡超导相.此外,我们预测和总结了铁基超导体中的各种拓扑相,发现载流子掺杂和层间耦合可以驱动系统在这些不同的拓扑相之间发生相变。

英文摘要:

We study topological vortex phases in iron-based superconductors. Besides the previously known vortex end Majorana zero modes (MZMs) phase stemming from the existence of a three dimensional (3D) strong topological insulator state, we show that there is another topologically nontrivial phase as iron-based superconductors can be doped superconducting 3D weak topological insulators (WTIs). The vortex bound states in a superconducting 3D WTI exhibit two different types of quantum states, a robust nodal superconducting phase with pairs of bulk MZMs and a full-gap topologically nontrivial superconducting phase which has single vortex end MZM in a certain range of doping level. Moreover, we predict and summarize various topological phases in iron-based superconductors, and find that carrier doping and interlayer coupling can drive systems to have phase transitions between these different topological phases.

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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