Scattering length instability in dipolar Bose-Einstein condensates.
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.
Bortolotti
D C E
DC
JILA, NIST and Department of Physics, University of Colorado, Boulder, CO 80309-0440, USA.
Ronen
S
S
Bohn
J L
JL
Blume
D
D