Continuous tuning of quantum critical behavior in hybrid Josephson junction arrays
Abstract
We report finite-temperature scaling of voltage-driven quantum phase transitions in hybrid Josephson junction arrays. A dual-gate geometry separately tunes interisland coupling and proximity-induced superconductivity, providing access to superconducting, insulating, and metallic transport regimes. The critical resistivity and scaling exponent evolve continuously with electrostatic tuning. Where the three regimes converge, the critical resistivity approaches h/4e2, consistent with the self-dual limit, while the scaling exponent approaches the quantum-percolation estimate. Tuning toward stronger insulating behavior raises the critical resistivity and shifts the scaling exponent toward the classical-percolation value, while both parameters decrease toward the metallic regime. These results connect scaling regimes previously reported in different two-dimensional superconducting systems through continuous electrostatic control.
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BibTeX
@misc{fugl2026continuous,
title = {{Continuous tuning of quantum critical behavior in hybrid Josephson junction arrays}},
author = {E. Fugl and L. L. Olsen and S. Sasmal and M. Efthymiou-Tsironi and G. Nagda and F. Krizek and L. Casparis and S. Vaitiekėnas},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.40104},
eprint = {2610.40104},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.40104},
}
RIS
TY - UNPB
TI - Continuous tuning of quantum critical behavior in hybrid Josephson junction arrays
AU - E. Fugl
AU - L. L. Olsen
AU - S. Sasmal
AU - M. Efthymiou-Tsironi
AU - G. Nagda
AU - F. Krizek
AU - L. Casparis
AU - S. Vaitiekėnas
PY - 2026
DA - 2026/10/29
PB - arXiv
DO - 10.48550/arxiv.2610.40104
UR - https://arxiv.org/abs/2610.40104
AB - We report finite-temperature scaling of voltage-driven quantum phase transitions in hybrid Josephson junction arrays. A dual-gate geometry separately tunes interisland coupling and proximity-induced superconductivity, providing access to superconducting, insulating, and metallic transport regimes. The critical resistivity and scaling exponent evolve continuously with electrostatic tuning. Where the three regimes converge, the critical resistivity approaches h/4e^2, consistent with the self-dual limit, while the scaling exponent approaches the quantum-percolation estimate. Tuning toward stronger insulating behavior raises the critical resistivity and shifts the scaling exponent toward the classical-percolation value, while both parameters decrease toward the metallic regime. These results connect scaling regimes previously reported in different two-dimensional superconducting systems through continuous electrostatic control.
ER -