Ultracold Few-Boson Systems in a Double-Well Trap

Abstract

We investigate the transition of a quasi-one-dimensional few-boson system from a weakly correlated to a fragmented and finally a fermionized ground state. Our numerically exact analysis, based on a multi-configurational method, explores the interplay between different shapes of external and inter-particle forces. Specifically, we demonstrate that the addition of a central barrier to an otherwise harmonic trap may supports the system's fragmentation, with a symmetry-induced distinction between even and odd atom numbers. Moreover, the impact of inhomogeneous interactions is studied, where the effective coupling strength is spatially modulated. It is laid out how the ground state can be displaced in a controlled way depending on the trap and the degree of modulation. We present the one- and two-body densities and, beyond that, highlight the role of correlations on the basis of the natural occupations.

References in corpus (5)

• General variational many-body theory with complete self-consistency for trapped bosonic systems
• Analytical solutions for the dynamics of two trapped interacting ultracold atoms
• Ground-state properties of one-dimensional ultracold Bose gases in a hard-wall trap
• Best mean-field for condensates
• Extracting Atoms on Demand with Lasers

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