Quantum effects on the BKT phase transition of two-dimensional Josephson arrays

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dc.creatorCuccoli, Alessandro
dc.creatorFubini, Andrea
dc.creatorTognetti, Valerio
dc.creatorVaia, Ruggero
dc.date1999-12-01
dc.date2000-02-03
dc.date.accessioned2026-07-07T11:29:50Z
dc.date.available2026-07-07T11:29:50Z
dc.descriptionThe phase diagram of two dimensional Josephson arrays is studied by means of the mapping to the quantum XY model. The quantum effects onto the thermodynamics of the system can be evaluated with quantitative accuracy by a semiclassical method, the {\em pure-quantum self-consistent harmonic approximation}, and those of dissipation can be included in the same framework by the Caldeira-Leggett model. Within this scheme, the critical temperature of the superconductor-to-insulator transition, which is a Berezinskii-Kosterlitz-Thouless one, can be calculated in an extremely easy way as a function of the quantum coupling and of the dissipation mechanism. Previous quantum Monte Carlo results for the same model appear to be rather inaccurate, while the comparison with experimental data leads to conclude that the commonly assumed model is not suitable to describe in detail the real system.
dc.description4 pages, 2 figures, to be published in Phys. Rev. B
dc.identifierhttps://arxiv.org/abs/cond-mat/9912008
dc.identifierhttp://arxiv.org/abs/cond-mat/9912008
dc.identifierPhys.Rev.B61:11289,2000
dc.identifierdoi:10.1103/PhysRevB.61.11289
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/196840
dc.subjectMesoscale and Nanoscale Physics
dc.subjectStatistical Mechanics
dc.titleQuantum effects on the BKT phase transition of two-dimensional Josephson arrays
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