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Reentrant behavior of the phase stiffness in Josephson junction arrays

Luca Capriotti·Alessandro Cuccoli·Andrea Fubini·Valerio Tognetti·Ruggero Vaia
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Abstract

The phase diagram of a 2D Josephson junction array with large substrate resistance, described by a quantum XY model, is studied by means of Fourier path-integral Monte Carlo. A genuine Berezinskii-Kosterlitz-Thouless transition is found up to a threshold value g* of the quantum coupling, beyond which no phase coherence is established. Slightly below g* the phase stiffness shows a reentrant behavior with temperature, in connection with a low-temperature disappearance of the superconducting phase, driven by strong nonlinear quantum fluctuations.

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Luca Capriotti, Alessandro Cuccoli, Andrea Fubini, Valerio Tognetti, Ruggero Vaia. 2003-11-17. Reentrant behavior of the phase stiffness in Josephson junction arrays. https://doi.org/10.1103/physrevlett.91.247004

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