Cold Bose gases near Feshbach resonances

Published in:

Physics Letters A 312,5-6 (2003) 277-286;


The lowest order constrained variational method [Phys. Rev. Lett. 88 (2002) 210403] has been generalized for a dilute (in the sense that the range of interatomic potential, R, is small compared with inter-particle spacing r(0)) uniform gas of bosons near the Feshbach resonance using the multi-channel zero-range potential model. The method has been applied to Na(F = 1, m(F) = 1) atoms near the B-0 = 907 G Feshbach resonance. It is shown that at high densities na(3) much greater than 1, there are significant differences between our results for the real part of energy per particle and the one-channel zero-range potential approximation. We point out the possibility of stabilization of the uniform condensate for the case of negative scattering length. (C) 2003 Elsevier Science B.V. All rights reserved.


einstein condensate;; scattering;; approximation;; collisions;; dynamics;; density;; systems;; rb-85

Date of this Version

January 2003

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