Dissipation mechanism above the current threshold in Josephson junction chains

Dissipation mechanism above the current threshold in Josephson junction chains
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约瑟夫森连接链中高于电流阈值的耗散机制

DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
A. Ustinov
A. Ustinov
中科院分区：
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文献类型：
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作者：
R. Schafer;W. Cui;K. Grube;H. Rotzinger;A. Ustinov

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本文给出了在$E_J / E_csimeq 1$。我们观察到一个阻塞零电流支路的小偏置电压。在一定电压$V_mathrm{sw}$以上，$I$-$V$的特性不连续地转变为一个耗散支路，其特征是与磁通相关的电导。四个样品中的三个显示出正向和反向电压扫描的明显滞后。我们观察到在$V_mathrm{sw}$之上的电导具有周期性的场依赖性，这可以用$P(E)$理论来描述，从而证明了Cooper对通过阵列输运的粘性动力学。
We present measurements on one-dimensional Josephson junction arrays formed by a chain of SQUID loops in the regime where $E_J / E_csimeq 1$. We observe a blockaded zero current branch for small bias voltages. Above a certain voltage $V_mathrm{sw}$ the $I$-$V$ characteristics changes discontinuously to a dissipative branch characterized by a flux dependent conductance. Three of four samples show a pronounced hysteresis for a forward and backward voltage sweep. We observe a periodic field dependence of the conductance above $V_mathrm{sw}$ which can be described with $P(E)$ theory for cooper-pairs and therefore gives evidence of viscous dynamics of Cooper pair transport through the array.