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(star) of the quantum coupling, beyond which no phase coherence is established. Slightly below g(star) 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.
Reentrant Behavior of the Phase Stiffness in Josephson Junction Arrays / L. CAPRIOTTI; A. CUCCOLI; A. FUBINI; V. TOGNETTI; R. VAIA. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 91:(2003), pp. 247004:1-247004:4. [10.1103/PhysRevLett.91.247004]
Reentrant Behavior of the Phase Stiffness in Josephson Junction Arrays
CUCCOLI, ALESSANDRO;FUBINI, ANDREA;TOGNETTI, VALERIO;
2003
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(star) of the quantum coupling, beyond which no phase coherence is established. Slightly below g(star) 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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