Coherent transport in Josephson-Junction rhombi chain with quenched disorder

Details Coherent transport in Josephson-Junction rhombi chain with quenched disorder Coherent transport in Josephson-Junction rhombi chain with quenched disorder

2005-10-27

arxiv.org/abs/cond-mat/0510766v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

21 pages, 5 figures

Scientific paper

10.1103/PhysRevB.74.064516

We consider a chain of Josephson-junction rhombi (proposed originally by Doucot and Vidal) in quantum regime. In a regular chain with no disorder in the maximally frustrated case when magnetic flux through each rhombi \Phi_r is equal to one half of superconductive flux quantum \Phi_0, Josephson current is due to correlated transport of pairs of Cooper pairs, i.e. charge is quantized in units of $4e$. Sufficiently strong deviation \delta\Phi =|\Phi_r-\Phi_0/2| > \delta\Phi^c from the maximally frustrated point brings the system back to usual $2e$-quantized supercurrent. For a regular chain \delta\Phi^c was calculated by us previously. Here we present detailed analysis of the effect of quenched disorder (random stray charges and random fluxes piercing rhombi) on the pairing effect.

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