Reentrant behavior of the phase stiffness in Josephson junction arrays
arXiv:cond-mat/0306291 · doi:10.1103/PhysRevLett.91.247004
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.
arXiv comment4 pages, 7 figures, to appear in Phys.Rev.Lett
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- Insulating Phase in Two-dimensional Josephson-Junction Arrays Investigated by Nonlinear Transport
- Berezinskii-Kosterlitz-Thouless transition in Josephson junction arrays
- Helicity modulus in the bilayer XY model by worm algorithm
- Phase and Charge reentrant phase transitions in two capacitively coupled Josephson arrays with ultra-small junction
- Bosonic Haldane insulator in the presence of local disorder: A quantum Monte Carlo study