Effects of an artificial gauge field in cold atoms ladders.

Citro R.

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II - Fisica della materia
Aula 32B-2 - Giovedì 20 h 09:00 - 13:00
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The effect of an artificial gauge field on a two-leg boson ladder is studied. It is shown that, in analogy with Josephson junction arrays, the system presents a Meissner phase, where a spin current flows along the legs, and a vortex phase, where chiral currents flow along the plaquettes. We study the phase diagram as a function of the flux, or spin-orbit interaction, and interactions. It is shown that in the interacting case a melting of the vortex phase occurs giving origin to a disordered region. We characterize the phases by the study of different observables, such as the spin current and the static structure factors, which could be tested in current experiments with cold atoms.

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