Stabilizing a purely dipolar quantum gas against collapse

Details Stabilizing a purely dipolar quantum gas against collapse Stabilizing a purely dipolar quantum gas against collapse

2007-10-19

arxiv.org/abs/0710.3643v1

Nature Physics 4, 218 (2008)

Physics

Condensed Matter

Other Condensed Matter

5 pages, 1 table, 3 figures

Scientific paper

10.1038/nphys887

We report on the experimental observation of the dipolar collapse of a quantum gas which sets in when we reduce the contact interaction below some critical value using a Feshbach resonance. Due to the anisotropy of the dipole-dipole interaction, the stability of a dipolar Bose-Einstein condensate depends not only on the strength of the contact interaction, but also on the trapping geometry. We investigate the stability diagram and find good agreement with a universal stability threshold arising from a simple theoretical model. Using a pancake-shaped trap with the dipoles oriented along the short axis of the trap, we are able to tune the scattering length to zero, stabilizing a purely dipolar quantum gas.

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