Josephson junctions with tunable current-phase relation
Josephson junctions with tunable current-phase relation
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DOI：
10.1103/physrevb.90.184502
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发表时间：
2012-08
影响因子：
3.7
通讯作者：
A. Lipman;R. Mints;R. Kleiner;D. Koelle;E. Goldobin
中科院分区：
文献类型：
--
作者：
A. Lipman;R. Mints;R. Kleiner;D. Koelle;E. Goldobin
本文考虑了由不对称的0和不同长度的区域L0和L组成的0-β约瑟夫森结，它们具有不同的临界电流密度jc，0和jc，β.如果两个段都相当短，则整个结可以由空间平均相位的有效电流-相位关系来描述，该关系包括通常的项Hssin（）、负二次谐波项Hssin（2）以及可由磁场H调谐的不寻常项HssH cos。因此，获得了电子可调的电流-相位关系。在H = 0时，这对应于约瑟夫森结。
We consider a 0-� Josephson junction consisting of asymmetric 0 andregions of different lengths L0 and Lhaving different critical current densities jc,0 and jc,�. If both segments are rather short, the whole junction can be described by an effective current-phase relation for the spatially averaged phase , which includes the usual term ∝ sin( ), a negative second harmonic term ∝ sin(2 ) as well as the unusual term ∝ H cos tunable by magnetic field H. Thus one obtains an electronically tunable current-phase relation. At H = 0 this corresponds to the ' Josephson junction.