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Transition by breaking of analyticity in the ground state of Josephson junction arrays as a static signature of the vortex jamming transition
Phys. Rev. E 85, 051132 – Published 22 May, 2012
DOI: https://doi.org/10.1103/PhysRevE.85.051132
Abstract
We investigate the ground state of the irrationally frustrated Josephson junction array with a controlling anisotropy parameter that is the ratio of the longitudinal Josephson coupling to the transverse one. We find that the ground state has one-dimensional periodicity whose reciprocal lattice vector depends on and is incommensurate with the substrate lattice. Approaching the isotropic point , the so-called hull function of the ground state exhibits analyticity breaking similar to the Aubry transition in the Frenkel-Kontorova model. We find a scaling law for the harmonic spectrum of the hull functions, which suggests the existence of a characteristic length scale diverging at the isotropic point. This critical behavior is directly connected to the jamming transition previously observed in the current-voltage characteristics by a numerical simulation. On top of the ground state there is a gapless continuous band of metastable states, which exhibit the same critical behavior as the ground state.
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