Supersolid phase in fully frustrated Josephson-junction arrays
Luigi Amico, Giuseppe Falci, Rosario Fazio, Gaetano Giaquinta
DOI 10.1103/PhysRevB.55.1100 · Physical Review B
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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 corresponding region at f=0 and it includes two different phases. In the chiral supersolid charges and vortices are arranged in a checkerboard pattern on a 2 × 2 supercell analogously to the unfrustrated case. We find a phase, which we term nonchiral supersolid, which has no corresponding phase at f=0. The excitation spectra in the supersolid regions show particlelike dispersion which is related to the existence of defectons. The defecton condensation leads to superfluidity in the presence of a charge-ordered background.
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