Hannover 2010 – scientific programme

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A: Fachverband Atomphysik

A 6: Ultra-Cold Atoms, Ions and BEC I (with Q)

A 6.5: Talk

Tuesday, March 9, 2010, 15:15–15:30, F 303

Correlation versus commensurability effects for finite bosonic systems in one-dimensional lattices — •Ioannis Brouzos — Zentrum fuer Optische Quantentechnologien, Luruper Chaussee 149, 22761 Hamburg, Germany

We investigate few-boson systems in finite one-dimensional multi-well traps covering the full interaction crossover from uncorrelated to fermionised particles. Our treatment of the ground state properties is based on a numerically exact multi-configurational time-dependent method. For commensurate filling we trace the fingerprints of localisation, as the interaction strength increases, in several observables like local and non-local densities, fluctuations and momentum distribution. In addition for filling factor larger than one we observe on-site repulsion effects and other features of the physics beyond the Bose-Hubbard model regime approaching the Tonks-Girardau limit. The presence of an incommensurate fraction of particles induces partial delocalisation and spatial modulations of the profiles, taking into account the finite size of the system.