Cold Bose Gases near Feshbach Resonances

Details Cold Bose Gases near Feshbach Resonances Cold Bose Gases near Feshbach Resonances

2003-05-29

arxiv.org/abs/cond-mat/0305692v1

Physics

Condensed Matter

Soft Condensed Matter

Revised version of cond-mat/0212196. Added Eqs. (21,22) and references for section 3

Scientific paper

The lowest order constrained variational method [Phys. Rev. Lett. 88, 210403 (2002)] has been generalized for a dilute (in the sense that the range of interatomic potential is small compared with inter-particle spacing) 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, 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 con densate for the case of negative scattering length.

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