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arXiv · 1310.4295

Dissipation mechanism above the current threshold in Josephson junction chains

Roland Schäfer·Wanyin Cui·Kai Grube·Hannes Rotzinger·Alexey V. Ustinov
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Abstract

We present measurements on one-dimensional Josephson junction arrays formed by a chain of SQUID loops in the regime where $E_J / E_c\simeq 1$. 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.

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Roland Schäfer, Wanyin Cui, Kai Grube, Hannes Rotzinger, Alexey V. Ustinov. 2013-10-16. Dissipation mechanism above the current threshold in Josephson junction chains. https://arxiv.org/abs/1310.4295

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