Stability of a BEC with Higher-order Interactions near a Feshbach Resonance

Details Stability of a BEC with Higher-order Interactions near a Feshbach Resonance Stability of a BEC with Higher-order Interactions near a Feshbach Resonance

2009-03-12

arxiv.org/abs/0903.2261v2

Phys. Rev. A 80, 023607 (2009)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 3 figures, Revtex4, revised version, changed title

Scientific paper

10.1103/PhysRevA.80.023607

We consider the stability of an ultracold trapped Bose-Einstein condensate near a Feshbach resonance. Using a modified Gross-Pitaevskii equation that includes higher-order terms and a multi-channel model of Feshbach resonances, we find regions where stability can be enhanced or suppressed around experimentally measured resonances. We suggest a number of ways to probe the stability diagram. Using scattering length zero-crossings huge deviations are founds for the critical particle number. Effects are enhanced for narrow resonances or tighter traps. Macroscopic tunneling of the condensate is another possible probe for higher-order interactions, however, to see this requires very narrow resonances or very small particle numbers.

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