Trapped Bose gases with large positive scattering length

Details Trapped Bose gases with large positive scattering length Trapped Bose gases with large positive scattering length

2007-06-22

arxiv.org/abs/0706.3300v1

EPL 79 (2007) 40002

Physics

Quantum Physics

Scientific paper

10.1209/0295-5075/79/40002

We calculate the energy and the condensate fraction of a system of trapped bosons interacting via a short-range two-body potential with positive scattering length. The potential is attractive and has a two-body bound state. When the scattering length is small compared to the trap length the system is model independent: all potential models -- attractive, repulsive and zero-range -- provide similar results. When the scattering length is large the attractive model differs qualitatively from the repulsive and zero-range models. In this regime the system with attractive potential becomes independent of the scattering length, with both the energy and the condensate fraction converging towards finite constants.

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