Spontaneous edge current in a small chiral superconductor with a rough surface
Spontaneous edge current in a small chiral superconductor with a rough surface
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具有粗糙表面的小型手性超导体中的自发边缘电流
DOI：
10.1103/physrevb.94.155302
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发表时间：
2016
影响因子：
3.7
通讯作者：
Yasuhiro Asano
中科院分区：
文献类型：
--
作者：
Shu-Ichiro Suzuki;Yasuhiro Asano
我们从理论上研究了具有表面粗糙度的小型手性超导体中的自发边缘电流。通过同时求解准经典Eilenberger方程和Maxwell方程，得到了对势和矢量势的自洽解。然后我们用它们来数值计算小型超导体中手性边缘电流的空间分布。自发边缘电流的特征行为很大程度上取决于有序参数的对称性，例如手性、手性和手性波配对。在手性波和手性波超导体的表面粗糙度下，边缘电流是鲁棒的。在手性波的情况下，表面粗糙度往往会翻转手性电流的方向。另一方面，当存在表面粗糙度时，手性波超导体中的边缘电流很脆弱。我们还讨论了自发磁化强度的温度依赖性，这是标准实验中的可测量值。
We study theoretically the spontaneous edge current in a small chiral superconductor with surface roughness. We obtained self-consistent solutions of the pair potential and the vector potential by solving the quasiclassical Eilenberger equation and the Maxwell equation simultaneously. We then employed them to calculate numerically the spatial distribution of the chiral edge current in a small superconductor. The characteristic behavior of the spontaneous edge current depends strongly on the symmetries of the order parameters such as chiral-, chiral-, and chiral-wave pairing. The edge current is robust under the surface roughness in the chiral- and chiral-wave superconductors. In the chiral-wave case, the surface roughness tends to flip the direction of the chiral current. On the other hand, the edge current in a chiral-wave superconductor is fragile when there is surface roughness. We also discuss the temperature dependence of a spontaneous magnetization, which is a measurable value in standard experiments.