One-dimensional Josephson junction arrays: Lifting the Coulomb blockade by depinning

Abstract

Experiments with one-dimensional arrays of Josephson junctions in the regime of dominating charging energy show that the Coulomb blockade is lifted at the threshold voltage, which is proportional to the array's length and depends strongly on the Josephson energy. We explain this behavior as de-pinning of the Cooper-pair-charge-density by the applied voltage. We assume strong charge disorder and argue that physics around the de-pinning point is governed by a disordered sine-Gordon-like model. This allows us to employ the well-known theory of charge density wave de-pinning. Our model is in good agreement with the experimental data.

Main: 4 pages, 2 figures, Appendix: 3 pages, 4 figures

References in corpus (2)

• Statics and dynamics of elastic manifolds in media with long-range correlated disorder
• Transport of charge-density waves in the presence of disorder: Classical pinning vs quantum localization

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