Stationary Josephson effect in ballistic graphene junctions: effects of inhomogeneous carrier density
Stationary Josephson effect in ballistic graphene junctions: effects of inhomogeneous carrier density
复制标题
弹道石墨烯结中的稳态约瑟夫森效应：不均匀载流子密度的影响
DOI：
10.1088/1742-6596/400/4/042057
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
K. Imura
中科院分区：
文献类型：
--
作者：
Y. Takane;K. Imura
我们研究了弹道石墨烯与两个超导电极平面接触系统中的稳态约瑟夫森效应。应用准经典的绿色函数方法，我们得到了约瑟夫森电流的一般表达式，该表达式在化学势远离狄拉克点时是有效的。在其推导中，我们以平行的方式处理单层和双层的情况，并考虑到在超导体覆盖的区域中载流子密度较高的事实。在此基础上研究了零温下约瑟夫森临界电流的行为。
We study the stationary Josephson effect in a system of ballistic graphene in planar contact with two superconducting electrodes. Applying a quasi-classical Green's function approach, we derive a general expression of the Josephson current which is valid whenever the chemical potential is away from the Dirac point. In its derivation we treat the mono- and bi-layer cases in a parallel manner, and take account of the fact that the carrier density is higher in the region covered by the superconductors. The behavior of the Josephson critical current is investigated at zero temperature on the basis of the obtained formula.