Vortical configurations in mesoscopic superconducting square loop with mixed pairing orders
Vortical configurations in mesoscopic superconducting square loop with mixed pairing orders
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具有混合配对顺序的介观超导方环中的涡旋构型
DOI：
10.1209/0295-5075/130/67005
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发表时间：
2020-07
期刊：
影响因子：
1.8
通讯作者：
Zha Guo-Qiao
中科院分区：
文献类型：
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作者：
Zha Guo-Qiao
基于微观Bogoliubov-de Gennes理论，我们研究了具有混合对序的介观超导方环中的涡旋位形。通过选择合适的相互作用强度和化学势，可以稳定自旋三重态p波和次优势自旋单重态d波配对对称性。在一个小的外部磁场中，不寻常的椭圆状旋涡手性p波的顺序，以及在d波的顺序拉长的旋涡往往形成在样品的对角线。对于一个扩大的通量，我们发现一个两量子skyrmionic模式的p波分量，而封闭的畴壁没有出现相比，在超导系统中的纯p波状态的以前的研究。特别是，一个新的多skyrmionic模式包含四个单量子skyrmions发生与增加的流量。这种由两个空间分离的半量子涡旋组成的单量子涡旋结构类似于具有单位拓扑荷的量子涡旋。此外，在强通量范围内，还发现了几种复杂的混合或多重skyrmionic组态。
Based on the microscopic Bogoliubov-de Gennes theory, we study vortical configurations in a mesoscopic superconducting square loop with mixed pairing orders. By choosing appropriate interaction strengths and chemical potential, the spin-triplet p-wave and subdominant spin-singlet d-wave pairing symmetries can be stabilized. In a small external magnetic field, unusual elliptical-like vortices in chiral p-wave orders as well as elongated vortices in the d-wave order tend to form in sample diagonals. For an enlarged flux, we find a two-quanta skyrmionic mode for the p-wave components, while the closed domain wall does not appear compared to the previous studies in superconducting systems with a pure p-wave state. Particularly, a novel multi-skyrmionic pattern containing four single-quanta skyrmions takes place with increasing flux. Such a single-quanta vortex structure consisting of two spatially separated half-quantum vortices is analogous to the nematic skyrmion with unit topological charge. In addition, several complex hybrid or multiple skyrmionic configurations are revealed in the strong flux range.