Phase diagram of Josephson junction arrays with capacitive disorder

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dc.creatorMancini, F. P.
dc.creatorSodano, P.
dc.creatorTrombettoni, A.
dc.date2002-05-27
dc.date2003-01-22
dc.date.accessioned2026-07-07T02:45:39Z
dc.date.available2026-07-07T02:45:39Z
dc.descriptionWe study the phase diagram at finite temperature of Josephson junction arrays with capacitive disorder (i.e., random offset charges and/or random charging energies): in the limit of large particle numbers per junction, this is a remarkable physical realization of the disordered boson Hubbard model. By using a mean-field approximation, we compute the average free energy and the equation for the phase boundary line between the insulating and the superconducting phase. We find that the Mott-insulating lobe structure disappears for large variance ($σ\gtrsim e$) of the offset charges probability distribution. Further, with nearest-neighbor interactions, the insulating lobe around $q=e$ is destroyed even for small values of $σ$. In the case of random charging energies, until the variance of the distribution reaches some critical value the superconducting phase increases in comparison to the situation in which all self-capacitances are equal.
dc.description11 pages, 7 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0205568
dc.identifierhttp://arxiv.org/abs/cond-mat/0205568
dc.identifierPhys. Rev. B 67, 014518 (2003)
dc.identifierdoi:10.1103/PhysRevB.67.014518
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/19371
dc.subjectSuperconductivity
dc.titlePhase diagram of Josephson junction arrays with capacitive disorder
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