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PreprintCC BY-NC-SA 4.0arXiv

Coulomb Blockade in a One-Dimensional Array of Strong Josephson Junctions

  • Bayan Karimi
  • Ze-Yan Chen
  • Jukka P. Pekola
  • T. Yamamoto
  • M. Houzet
  • L. I. Glazman
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Abstract

We measure current across a voltage-biased, long array of Josephson junctions. Current-voltage characteristics do not reveal any critical current and instead display the presence of threshold voltage and finite activation energy, consistent with the Coulomb blockade. However, the respective energy scale is well below the value prescribed by a single-island geometric capacitances. We explain it by strong quantum fluctuations of charge associated with a large value of Josephson energy, EJ≫ EC, where EC is the charging energy associated with the inter-island capacitance. Comparison between the data and theory points to an exponential (in parameter EJ/EC) suppression of the threshold. We achieve a quantitative agreement with theory by accounting for charge-e solitons associated with the quasiparticles entering the array from its leads. This scenario however underestimates the current below threshold in comparison with the experiment.

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Cite

BibTeXRIS
BibTeX
@misc{karimi2026coulomb,
  title = {{Coulomb Blockade in a One-Dimensional Array of Strong Josephson Junctions}},
  author = {Bayan Karimi and Ze-Yan Chen and Jukka P. Pekola and T. Yamamoto and M. Houzet and L. I. Glazman},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.02798},
  eprint = {2611.02798},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.02798},
  note = {CC BY-NC-SA 4.0},
}
RIS
TY  - UNPB
TI  - Coulomb Blockade in a One-Dimensional Array of Strong Josephson Junctions
AU  - Bayan Karimi
AU  - Ze-Yan Chen
AU  - Jukka P. Pekola
AU  - T. Yamamoto
AU  - M. Houzet
AU  - L. I. Glazman
PY  - 2026
DA  - 2026/11/02
PB  - arXiv
DO  - 10.48550/arxiv.2611.02798
UR  - https://arxiv.org/abs/2611.02798
AB  - We measure current across a voltage-biased, long array of Josephson junctions. Current-voltage characteristics do not reveal any critical current and instead display the presence of threshold voltage and finite activation energy, consistent with the Coulomb blockade. However, the respective energy scale is well below the value prescribed by a single-island geometric capacitances. We explain it by strong quantum fluctuations of charge associated with a large value of Josephson energy, E_J≫ E_C, where E_C is the charging energy associated with the inter-island capacitance. Comparison between the data and theory points to an exponential (in parameter E_J/E_C) suppression of the threshold. We achieve a quantitative agreement with theory by accounting for charge-e solitons associated with the quasiparticles entering the array from its leads. This scenario however underestimates the current below threshold in comparison with the experiment.
ER  -