Coulomb gap triptychs, √2 effective charge, and hopping transport in periodic arrays of superconductor grains

  title={Coulomb gap triptychs, √2 effective charge, and hopping transport in periodic arrays of superconductor grains},
  author={Tianran Chen and Brian Skinner and B. I. Shklovskii},
  journal={Physical Review B},
In granular superconductors, individual grains can contain bound Cooper pairs while the system as a whole is strongly insulating. In such cases the conductivity is determined by electron hopping between localized states in individual grains. Here we examine a model of hopping conductivity in such an insulating granular superconductor, where disorder is assumed to be provided by random charges embedded in the insulating gaps between grains. We use computer simulations to calculate the single… 

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