Supersolid phase in fully frustrated Josephson junction arrays

Abstract

We study the phase diagram and the excitation spectra of an array of small Josephson junctions at $f=1/2$ and arbitrary charge frustration. We find that the supersolid region in the phase diagram is larger than the correspondent region at $f=0$ and it includes two different phases.In the chiral supersolid (SS) charges and vortices are arranged in a checkerboard pattern on a $2\times 2$ supercell analogously to the unfrustrated case. We find a new phase, which we term {\em non-chiral supersolid} (NCSS), which has no corresponding phase at $f=0$. The excitation spectra in the supersolid regions show particle like dispersions which is related to the defectons. The defecton condensation leads to superfluidity in the presence of charge ordered background.

16 pages REVTEX , 14 figures.ps

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Cited by in corpus (4)

• Quantum Phase Transitions and Vortex Dynamics in Superconducting Networks
• Phase separation in supersolids
• Phase diagrams, critical and multicritical behavior of hard-core Bose-Hubbard models
• Exact duality and dual Monte-Carlo simulation for the Bosonic Hubbard model