Physics – Condensed Matter – Quantum Gases
Scientific paper
2010-05-17
Phys. Rev. A 81, 053613 (2010)
Physics
Condensed Matter
Quantum Gases
16 pages, 16 figures
Scientific paper
10.1103/PhysRevA.81.053613
We investigate few-boson systems in finite one-dimensional multi-well traps covering the full interaction crossover from uncorrelated to fermionized particles. Our treatment of the ground state properties is based on the numerically exact Multi-Configurational Time-Dependent Hartree method. For commensurate filling we trace the fingerprints of localisation, as the interaction strength increases, in several observables like reduced density matrices, fluctuations and momentum distribution. For filling factor larger than one we observe on-site repulsion effects in the densities and fragmentation of particles beyond the validity of the Bose-Hubbard model upon approaching the Tonks-Girardeau limit. The presence of an incommensurate fraction of particles induces incomplete localisation and spatial modulations of the density profiles, taking into account the finite size of the system.
Brouzos Ioannis
Schmelcher Peter
Zöllner Sascha
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