Realization of Fully Frustrated Josephson-Junction Arrays with Cold Atoms

Marco Polini; Rosario Fazio; A. H. MacDonald; M. P. Tosi

doi:10.1103/PhysRevLett.95.010401

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Realization of Fully Frustrated Josephson-Junction Arrays with Cold Atoms

Marco Polini, Rosario Fazio, A. H. MacDonald, M. P. Tosi

DOI 10.1103/PhysRevLett.95.010401 · Physical Review Letters

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Abstract

Fully frustrated Josephson-junction arrays (FF-JJA’s) exhibit a subtle compound phase transition in which an Ising transition associated with discrete broken translational symmetry and a Berezinskii-Kosterlitz-Thouless transition associated with quasi-long-range phase coherence occur nearly simultaneously. In this Letter we discuss a cold-atom realization of the FF-JJA system. We demonstrate that both orders can be studied by standard momentum-distribution-function measurements and present numerical results, based on a successful self-consistent spin-wave approximation, that illustrate the expected behavior of observables.