Magnetic Field Driven Quantum Phase Transitions in Josephson Arrays
Abstract
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.
Keywords
Cite
@article{arxiv.1112.6377,
title = {Magnetic Field Driven Quantum Phase Transitions in Josephson Arrays},
author = {J. Paramanandam and M. T. Bell and L. B. Ioffe and M. E. Gershenson},
journal= {arXiv preprint arXiv:1112.6377},
year = {2012}
}
Comments
11 pages, 4 figures