Topological defect states in mesoscopic superconducting squares with spin correlations

Topological defect states in mesoscopic superconducting squares with spin correlations
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具有自旋相关性的介观超导方块中的拓扑缺陷态

DOI:
10.1209/0295-5075/129/27002
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发表时间:
2020-02
期刊:
EPL
影响因子:
1.8
通讯作者:
Chai Rui-Feng
Chai Rui-Feng
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Zha Guo-Qiao;Chai Rui-Feng

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在微观Bogoliubov-de Gennes理论框架下,研究了具有自旋关联的介观超导正方形系统中的拓扑缺陷态。通过选择合适的能带参数,可以实现序参量的主导自旋-三重态波配对对称性。在零外磁场下,单畴壁态倾向于作为系统的基态出现。当外加磁场时,无涡旋基态的三种(反)涡旋模式之间存在场驱动相变。随着外场的增加,大量具有不同拓扑荷的无核单skyrmion态可以作为基态出现。特别是,一个新的手征畴壁基态携带分数总通量量子可以发生,伴随着一个不封闭的半量子涡旋链的相位差分布。在强流区还发现了几个独特的亚稳态。
In the framework of the microscopic Bogoliubov-de Gennes theory, we study the topological defect states in mesoscopic superconducting square systems with spin correlations. The dominant spin-triplet -wave pairing symmetry of order parameters can be realized by choosing appropriate band parameters. At zero external magnetic field, the single-domain-wall state tends to emerge as the ground state of the system. When the magnetic field is applied, there exist field-driven phase transitions among three types of (anti)vortex patterns for the vortex-free ground state. With increasing field, a large number of coreless single-skyrmionic states with different topological charges can appear as the ground states. In particular, a novel chiral domain-wall ground state carrying fractional total flux quanta can take place, accompanied by an unclosed half-quantum-vortex chain in the phase difference profile. Several unique metastable states are also revealed in the strong flux range in the present system.
具有自旋轨道相互作用的介观超导环系统中的马约拉纳零能量模式和自旋电流演化
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