New phenomena in Josephson SINIS junctions.
New phenomena in Josephson SINIS junctions.
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约瑟夫森 SINIS 结点的新现象。
DOI：
10.1103/physrevlett.74.4730
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发表时间：
1995
影响因子：
8.6
通讯作者：
A. Volkov
中科院分区：
文献类型：
--
作者：
A. Volkov
我们分析了在$N$层中有额外偏置电流流过的${S}_{a}{\mathrm{INIS}}_{b}$结中的直流和交流约瑟夫森效应。低温和电压$(eV,T\ensuremath{\ll}\ensuremath{\Delta})$的情况被认为是肮脏的限制。我们表明，临界约瑟夫森电流可能改变符号，如果${N/S}_{a}$接口上的电压降超过一定值$({\mathrm{eV}}_{N}g\ensuremath{\Delta}/\sqrt{2})$，则所考虑的SINIS结可能成为\ensuremath{\pi}结。即使电流只流过${N/S}_{a}$界面，也可能产生交流约瑟夫森效应，而通过${S}_{b}/N$界面的电流则不存在。
We analyze the dc and ac Josephson effects in ${S}_{a}{\mathrm{INIS}}_{b}$ junctions in which an additional bias current flows in the $N$ layer. The case of low temperatures and voltages $(eV,T\ensuremath{\ll}\ensuremath{\Delta})$ is considered in the dirty limit. We show that the critical Josephson current may change sign, and the considered SINIS junction may become a \ensuremath{\pi} junction if the voltage drop across the ${N/S}_{a}$ interface exceeds a certain value $({\mathrm{eV}}_{N}g\ensuremath{\Delta}/\sqrt{2})$. The ac Josephson effect may arise even if the current flows only through the ${N/S}_{a}$ interface, whereas the current through the ${S}_{b}/N$ interface is absent.