Influence of impurities and surface defects on the flux-induced current in mesoscopic d-wave superconducting loops
Influence of impurities and surface defects on the flux-induced current in mesoscopic d-wave superconducting loops
复制标题
杂质和表面缺陷对介观d波超导回路磁通感应电流的影响
DOI：
10.1103/physrevb.84.132501
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发表时间：
2011-10
影响因子：
3.7
通讯作者：
Peeters, F. M.
中科院分区：
文献类型：
--
作者：
Zha, Guo-Qiao;Milosevic, M. V.;Zhou, Shi-Ping;Peeters, F. M.
通过数值求解Bogoliubov-de Gennes方程组，研究了含有杂质和表面缺陷的介观$d$波超导环中超导电流的磁通量依赖性.在杂质的存在下，束缚态出现接近费米能。在单一杂质的情况下，磁通感应电流被发现被抑制。当由于量子干涉效应而在样品中引入更多杂质时，这可能是不同的，量子干涉效应敏感地取决于杂质之间的相对位置。我们进一步分析了小的表面缺陷在内部或外部边缘的循环的效果，并表明，压痕和凸起的缺陷有明显的和不同的超电流的影响。
We investigated the magnetic flux dependence of the supercurrent in mesoscopic $d$-wave superconducting loops, containing impurities and surface defects, by numerically solving the Bogoliubov--de Gennes equations self-consistently. In the presence of impurities, bound states arise close to the Fermi energy. In the case of a single impurity, the flux-induced current is found to be suppressed. This can be different when more impurities are introduced in the sample due to the quantum interference effect, which depends sensitively on the relative position between the impurities. We further analyze the effect of small surface defects at the inner or outer edge of the loop, and show that indentation and bulge defects have pronounced and different effects on the supercurrent.