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Realization of Fully Frustrated Josephson-Junction Arrays with Cold Atoms

2005; American Physical Society; Volume: 95; Issue: 1 Linguagem: Inglês

10.1103/physrevlett.95.010401

1092-0145

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

Quantum and electron transport phenomena

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.