M. Thøgersen et al 2007 EPL 79 40002 doi:10.1209/0295-5075/79/40002
M. Thøgersen, D. V. Fedorov and A. S. Jensen
Show affiliationsWe 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.
03.75.Hh Static properties of condensates; thermodynamical, statistical and structural properties
Issue 4 (August 2007)
Received 30 May 2007, accepted for publication 26 June 2007
Published 19 July 2007
M. Thøgersen et al 2007 EPL 79 40002
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