Reentrant behavior of the phase stiffness in Josephson junction arrays |
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Authors: | Capriotti Luca Cuccoli Alessandro Fubini Andrea Tognetti Valerio Vaia Ruggero |
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Affiliation: | Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106, USA. |
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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( small star, filled ) of the quantum coupling, beyond which no phase coherence is established. Slightly below g( small star, filled ) 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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