| Issue |
EPL
Volume 79, Number 4, August 2007
|
|
|---|---|---|
| Article Number | 40002 | |
| Number of page(s) | 6 | |
| Section | General | |
| DOI | https://doi.org/10.1209/0295-5075/79/40002 | |
| Published online | 19 July 2007 | |
Trapped Bose gases with large positive scattering length
IFA, Aarhus University - 8000 Aarhus C, Denmark
Received:
30
May
2007
Accepted:
26
June
2007
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.
PACS: 03.75.Hh – Static properties of condensates; thermodynamical, statistical, and structural properties / 03.75.Nt – Other Bose-Einstein condensation phenomena / 21.45.+v – Few-body systems
© Europhysics Letters Association, 2007
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