Necklacelike Pattern of Vortex Bound States by Zhiyong Hou, Kailun Chen, Wenshan Hong, Da Wang, Wen Duan, Huan Yang, Shiliang Li, Huiqian Luo, Qiang-Hua Wang, Tao Xiang, Hai-Hu Wen

“…Here, however, we report a completely new type of vortex pattern which is necklacelike in an iron-based superconductor KCa_{2}Fe_{4}As_{4}F_{2}. Our theoretical analysis shows that this necklacelike vortex pattern arises primarily from selective off-shell interference between vortex bound states of opposite angular momenta in the presence of rotational symmetry breaking due to disorders. …”
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