Thermally activated conductance in arrays of small Josephson junctions

Abstract

We present measurements of the temperature-dependent conductance for series arrays of small-capacitance SQUIDs. At low bias voltages, the arrays exhibit a strong Coulomb blockade, which we study in detail as a function of temperature and Josephson energy $E_J$. We find that the zero-bias conductance is well described by thermally activated charge transport with the activation energy on the order of $\Lambda E_C$, where $\Lambda$ is the charge screening length in the array and $E_C$ is the charging energy of a single SQUID.

arXiv comment6 pages, 3 figures

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• Parity effect and single-electron injection for Josephson-junction chains deep in the insulating state
• Correlated transport through junction arrays in the small Josephson energy limit: incoherent Cooper-pairs and hot electrons
• Depinning of disordered bosonic chains
• Quantum heat waves in a one-dimensional condensate
• Diagrammatic description of a system coupled strongly to a bosonic bath
• Gate-controlled conductance of superconducting NbN nanowires: coherent quantum phase-slips or Coulomb blockade?