Quantum Phase Transitions and Persistent Currents in Josephson-Junction Ladders

Details Quantum Phase Transitions and Persistent Currents in Josephson-Junction Ladders Quantum Phase Transitions and Persistent Currents in Josephson-Junction Ladders

2003-02-27

arxiv.org/abs/cond-mat/0302567v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

To appear in Phys. Rev. B; title has been changed; a few parts of the text have been change; 12 pages, 17 figures

Scientific paper

10.1103/PhysRevB.68.144506

In this work we study quantum phase transitions and persistent currents in capacitively coupled one-dimensional Josephson-junction arrays. We will focus particularly on the roles of exciton-like pairs in the strong coupling limit in the presence of external gate charges and magnetic fluxes. We use the numerical density-matrix renormalization group method for the study in the full range of values of gate charge and magnetic flux. To clarify the various effects, we report the pair correlation functions and the exciton densities as welll as the persistent current.

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