title: Realization of fully frustrated Josephson-junction arrays with cold atoms.
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.
authors.affiliation: NEST-INFM and Classe di Scienze, Scuola Normale Superiore, I-56126 Pisa, Italy. m.polini@sns.it
authors.forename: Marco
authors.initials: M
authors.lastname: Polini
authors.forename: Rosario
authors.initials: R
authors.lastname: Fazio
authors.forename: A H
authors.initials: AH
authors.lastname: MacDonald
authors.forename: M P
authors.initials: MP
authors.lastname: Tosi