发表机构
Okayama University（冈山大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文采用Bogoliubov-de Gennes理论研究s±d波向列超导体中有无孪晶界时的涡旋局域电子态，发现孪晶界捕获的涡旋含分数涡旋束缚对及弱诱导的s±id波分量，其计算结果与FeSe的STM涡旋图像相符。
AI 中文摘要
本文研究了s±d波向列超导体中涡旋的局域电子态，分别在无孪晶界和有孪晶界的两种情形下展开。采用紧束缚模型的Bogoliubov-de Gennes理论，其中向列性由转移积分的各向异性以及最近邻格点间的吸引相互作用来表征。我们计算了对势的s波和d波分量以及局域态密度，分析了向列性对有无孪晶界时涡旋芯结构的影响。研究发现，被孪晶界捕获的单个涡旋由分数涡旋的束缚对构成，伴随弱诱导的s±id波分量，而该分量在零磁场下不会出现。我们将计算得到的局域电子态空间结构与铁基超导体FeSe中通过STM实验测得的涡旋图像进行了对比。
英文摘要
Local electronic states of vortices in an s $\pm$ d wave nematic superconductor are studied both in the absence and presence of twin boundaries. The Bogoliubov-de Gennes theory for a tight-binding model is used with its nematicity represented by the anisotropy in the transfer integrals and attractive interactions between the nearest-neighbor sites. We evaluate s and d wave components of the pair potentials and the local density of states, and analyze the effects of nematicity on the vortex core structures with/without twin boundaries. We find that a single vortex trapped at the twin boundary is composed of a bound pair of fractional vortices accompanied by weakly-induced s $\pm$ id wave components, despite that such s $\pm$ id wave components do not appear in a zero magnetic field. The calculated spatial structures of the local electronic states are compared with the vortex image measured by STM experiments in an iron-based superconductor FeSe.
Comments9 pages, 9 figures,
