Effect of surface defects on order modulations in mesoscopic p-wave superconducting loops
Effect of surface defects on order modulations in mesoscopic p-wave superconducting loops
复制标题
表面缺陷对介观p波超导环阶次调制的影响
DOI：
10.1140/epjb/e2019-100455-2
复制
发表时间：
2019-11
影响因子：
1.6
通讯作者：
Zha Guo-Qiao
中科院分区：
文献类型：
--
作者：
Zhang Yuan;Zha Guo-Qiao
通过数值求解Bogoliubov-de Gennes方程组，研究了表面缺陷对具有螺纹磁通的介观p波超导非圆环序参量调制的影响.对于正方形环的情形，当在外边界或内边界的中心引入正方形凹陷缺陷时，总能量和磁通中电流的突变模式发生突变演化，并伴随着手征级对角对称和非对称空间分布状态之间的相变.特别是，特殊的空间模式的订单可以发生与移动的压痕缺陷远离边缘中心或定位在样品的内部或外部边缘的凸起缺陷。此外，两个不同的外部尺寸的矩形环的情况下进行了研究，我们认为在短边或长边的样品的中间的方形压痕缺陷的效果。由于深宽比效应和缺陷效应的影响，在阶模上可以发现更为复杂的现象。
The effect of surface defects on the modulations of order parameters in mesoscopic p-wave superconducting noncircular loops with threaded magnetic flux is investigated by numerically solving the Bogoliubov-de Gennes equations self-consistently. For the case of a square loop, the sharp-jump evolution of the total energy and the sawtooth pattern of the current in flux take place when a square indentation defect is introduced at the center of the outer or inner boundary, accompanied by phase transitions between the states with diagonal-symmetric and asymmetric spatial profiles of chiral orders. Particularly, peculiar spatial patterns of the orders can occur with moving the indentation defect farther from the edge center or positioning the bulge defect at the inner or outer edge of the sample. Furthermore, the cases of two rectangular loops with different outer sizes were investigated where we consider the effect of a square indentation defect in the middle of the short or the long side of the sample. More complicated phenomena on the order modes can be found due to the aspect-ratio effect as well as the defect effect.