Self-Consistent Mean-Field Theory for Frustrated Josephson Junction Arrays

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We review the self-consistent mean-field theory for charge-frustrated Josephson junction arrays. Using <cos(ϕ)> (ϕis the phase of the superconducting wavefunction) as order parameter and imposing the self-consistency condition, we compute the phase boundary line between the superconducting region (<cos(ϕ)> not equal to zero) and the insulating one (<cos(ϕ)> = 0). For a uniform offset charge q=e the superconducting phase increases with respect to the situation in which q=0. Here, we generalize the self-consistent mean-field theory to include the effects induced by a random distribution of offset charges and/or of diagonal self-capacitances. For most of the phase diagram, our results agree with the outcomes of Quantum Monte Carlo simulations as well as with previous studies using the path-integral approach.
Presented by F. P. Mancini at the Conference "Highlights in Condensed Matter Physics", May 9-11 2003, Salerno, Italy

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Superconductivity

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http://salesiana.dossiersoluciones.com/handle/123456789/22794

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0311640
 http://arxiv.org/abs/cond-mat/0311640
 Highlights in Condensed Matter Physics, A. Avella, R. Citro, C. Noce and M. Salerno eds., AIP Conference Proceedings Vol. 695, pp. 164-175, AIP Press, New York (2003), ISBN 0-7354-0167-5
 doi:10.1063/1.1639587

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arXiv