Investigation of dipolar Bose Einstein condensates – Niels Bohr Institute - University of Copenhagen

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Niels Bohr Institute > Calendar > 2009 > Investigation of dipol...

Investigation of dipolar Bose Einstein condensates

Chromium atoms carry a very large magnetic moment of 6 Bohr magnetons.

This leads to significant magnetic forces between the atoms in a chromium Bose-Einstein condensate. Such dipole-dipole interactions in quantum gases have recently gained much interest due to their long-range and anisotropic character which greatly differs from the well known s-wave scattering. Though being still rather weak on an absolute scale, these forces can become the dominant interaction when a Feshbach resonance is used to reduce the contact interaction to zero. A condensate in this purely dipolar regime shows very specific behavior.

The dynamic and static properties of such a condensate, for instance, depend on the geometry of the trap. I will present our recent experimental results like the stability diagram of a dipolar BEC and the dynamics of the dipolar collapse of a condensate and discuss some further interesting properties of gases with dipolar interactions.