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Supersolid phase in fully frustrated Josephson junction arrays

Luigi Amico·Giuseppe Falci·Rosario Fazio·Gaetano Giaquinta
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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.

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Luigi Amico, Giuseppe Falci, Rosario Fazio, Gaetano Giaquinta. 1996-08-08. Supersolid phase in fully frustrated Josephson junction arrays. https://doi.org/10.1103/physrevb.55.1100

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