Qin Shengshan, Hu Lunhui, Wu Xianxin, Dai Xia, Fang Chen, Zhang Fu-Chun, Hu Jiangping
Kavli Institute of Theoretical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China; Beijing National Research Center for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Department of Physics, University of California, San Diego, CA 92093, USA; Kavli Institute of Theoretical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.
Sci Bull (Beijing). 2019 Sep 15;64(17):1207-1214. doi: 10.1016/j.scib.2019.07.011. Epub 2019 Jul 15.
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.
我们研究铁基超导体中的拓扑涡旋相。除了先前已知的源于三维（3D）强拓扑绝缘体状态而存在的涡旋端马约拉纳零模（MZM）相之外，我们还表明存在另一种拓扑非平凡相，因为铁基超导体可以被掺杂成为超导三维弱拓扑绝缘体（WTI）。超导三维WTI中的涡旋束缚态表现出两种不同类型的量子态，一种是具有成对体MZM的稳健节点超导相，另一种是在特定掺杂水平范围内具有单个涡旋端MZM的全隙拓扑非平凡超导相。此外，我们预测并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。
Zotero 插件