Comparing contact and dipolar interaction in a Bose-Einstein condensate

Details Comparing contact and dipolar interaction in a Bose-Einstein condensate Comparing contact and dipolar interaction in a Bose-Einstein condensate

2006-08-07

arxiv.org/abs/cond-mat/0608171v1

Physical Review Letters 97, 250402 (2006)

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

10.1103/PhysRevLett.97.250402

We have measured the relative strength $\epsilon_dd$ of the magnetic dipole-dipole interaction compared to the contact interaction in a chromium Bose-Einstein condensate. We analyze the asymptotic velocities of expansion of a dipolar chromium BEC with different orientations of the atomic magnetic dipole moments. By comparing them with numerical solutions of the hydrodynamic equations for dipolar condensates, we are able to determine $\epsilon_dd = 0.159\pm0.034$ with high accuracy. Since the absolute strength of the dipole-dipole interaction is known exactly, the relative strength of the dipoledipole interaction can be used to determine the s-wave scattering length $a = 5.08\pm1.06\cdot10^-9 m = 96\pm20 a0$ of 52Cr. This is fully consistent with our previous measurements on the basis of Feshbach resonances.

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