Magnetic Field Driven Quantum Phase Transitions in Josephson Arrays

Details Magnetic Field Driven Quantum Phase Transitions in Josephson Arrays Magnetic Field Driven Quantum Phase Transitions in Josephson Arrays

2011-12-29

arxiv.org/abs/1112.6377v2

Physics

Condensed Matter

Disordered Systems and Neural Networks

11 pages, 4 figures

Scientific paper

We have studied the magnetic-field-driven quantum phase transitions in Josephson junction arrays with a large coordination number. The characteristic energies were extracted in both the superconducting and insulating phases by integrating the current-voltage characteristics over a voltage range 2eV\leqk_B T. For the arrays with a relatively strong Josephson coupling, we observed duality between the energies in the superconducting and insulating phases. The arrays with a weaker Josephson coupling demonstrate an intermediate, "bad metal" regime in weak magnetic fields; this observation underlines the importance of vortex pinning at large scales and, presumably, emergent inhomogeneity in the presence of strong offset charge disorder.

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