Edge effects in the magnetic interference pattern of a ballistic SNS junction
Edge effects in the magnetic interference pattern of a ballistic SNS junction
复制标题
弹道 SNS 结的磁干涉图案中的边缘效应
DOI：
10.1103/physrevb.93.184506
复制
发表时间：
2016
影响因子：
3.7
通讯作者：
L. Glazman
中科院分区：
文献类型：
--
作者：
H. Meier;V. Fal’ko;L. Glazman
我们研究了宽超导体-正常金属-超导体(SNS)结的约瑟夫森临界电流随穿线磁通的函数关系。与传统的夫琅和费型依赖相比，从侧边反射的电子轨迹改变了函数$i_c(\Phi)$。在弱磁场下，$B\less sim\Phi_0/d^2$，边缘效应使$i_c(\Phi)$中的零点上升，并逐渐将该函数的最小值向磁通量的半整数倍移动。在$B>；\Phi_0/d^2$处，边缘效应导致临界电流$i_c(\Phi)$随$\Phi$的增加而加速衰减。在更大的领域，最终，系统有望进入一个“经典”介观波动的区域，这是具有粗糙边缘的宽弹道SNS结所特有的。
We investigate the Josephson critical current $I_c(\Phi)$ of a wide superconductor-normal metal-superconductor (SNS) junction as a function of the magnetic flux $\Phi$ threading it. Electronic trajectories reflected from the side edges alter the function $I_c(\Phi)$ as compared to the conventional Fraunhofer-type dependence. At weak magnetic fields, $B\lesssim \Phi_0/d^2$, the edge effect lifts zeros in $I_c(\Phi)$ and gradually shifts the minima of that function toward half-integer multiples of the flux quantum. At $B>\Phi_0/d^2$, the edge effect leads to an accelerated decay of the critical current $I_c(\Phi)$ with increasing $\Phi$. At larger fields, eventually, the system is expected to cross into a regime of "classical" mesoscopic fluctuations that is specific for wide ballistic SNS junctions with rough edges.