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arXiv 2007.08276cond-mat.supr-concond-mat.dis-nn
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二维Rashba耦合超导体中非均匀塞曼场自发产生的涡旋

Spontaneous generation of vortices by a nonuniform Zeeman field in a two-dimensional Rashba coupled superconductor

A. G. Mal'shukov

摘要:

电子交换相互作用和自旋轨道耦合的相互作用导致在磁性绝缘体岛附近的自发超电流,磁性绝缘体岛放置在二维(2D)超导体的顶部,并且其磁化平行于2D电子气。结果表明,在对比研究的情况下,这种效果只涉及拓扑平凡的空间变化的超导序参量,应该考虑到超导涡流。后者是自发产生的岛屿周围的边界的任意形状,并导致筛选的塞曼场。这个问题已经被认为是电子受到强Rashba自旋轨道耦合,包括狄拉克系统以及。在后一种情况下,涡旋可以携带马约拉纳零模式。

英文摘要:

The interplay of the electron exchange interaction and spin-orbit coupling results in spontaneous supercurrents near magnetic insulator islands, which are placed on the top of a two-dimensional (2D) superconductor, and whose magnetization is parallel to 2D electron gas. It is shown that in contrast to the well studied situation, where such an effect involves only topologically trivial spatial variations of the superconducting order parameter, one should take into account supercurrent vortices. The latter are spontaneously generated around the island's boundary of an arbitrary shape and result in screening of the Zeeman field. This problem has been considered for electrons subject to a strong Rashba spin-orbit coupling, including Dirac systems as well. In the latter case vortices can carry Majorana zero modes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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