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Scattering Length Instability in Dipolar Bose-Einstein Condensates

2006; American Physical Society; Volume: 97; Issue: 16 Linguagem: Inglês

10.1103/physrevlett.97.160402

1092-0145

Daniele C. E. Bortolotti, Shai Ronen, John L. Bohn, D. Blume,

Quantum, superfluid, helium dynamics

We predict a new kind of instability in a Bose-Einstein condensate composed of dipolar particles. Namely, a comparatively weak dipole moment can produce a large, negative two-body scattering length that can collapse the Bose-Einstein condensate. To verify this effect, we validate mean-field solutions to this problem using exact, diffusion Monte Carlo methods. We show that the diffusion Monte Carlo energies are reproduced accurately within a mean-field framework if the variation of the $s$-wave scattering length with the dipole strength is accounted for properly.