Quantum Phase Transitions in Capacitively Coupled Two-Dimensional Josephson-Junction Arrays

Physics – Condensed Matter – Mesoscale and Nanoscale Physics

Scientific paper

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To appear in J. of Physics: Condensed Matter

Scientific paper

10.1088/0953-8984/10/43/022

Quantum-phase transitions in two layers of ultrasmall Josephson junctions, coupled capacitively with each other, are investigated. As the interlayer capacitance is increased, the system at zero temperature is found to exhibit an insulator-to-superconductor transition. It is shown that, unlike one-dimensional arrays with a similar coupling configuration, the transition cannot be accounted for exclusively by particle-hole pairs.

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