Supersolid phase in fully frustrated Josephson junction arrays

Details Supersolid phase in fully frustrated Josephson junction arrays Supersolid phase in fully frustrated Josephson junction arrays

1996-08-08

arxiv.org/abs/cond-mat/9608044v1

Physics

Condensed Matter

16 pages REVTEX , 14 figures.ps

Scientific paper

10.1103/PhysRevB.55.1100

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.

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