Comparing Contact and Dipolar Interactions in a Bose-Einstein Condensate

Year: 2006

Authors: Griesmeier A., Stuhler J., Koch T., Fattori M., Pfau T., Giovanazzi S.

Autors Affiliation: 5. Physikalisches Institut, Universität Stuttgart, 70550 Stuttgart, Germany

Abstract: We have measured the relative strength edd of the magnetic dipole-dipole interaction compared with the contact interaction in a dipolar chromium Bose-Einstein condensate. We analyze the asymptotic velocities of expansion of the condensate with different orientations of the atomic magnetic moments. By comparing the experimental results with numerical solutions of the hydrodynamic equations for dipolar condensates, we obtain edd=0. 159±0.034. We use this result to determine the s-wave scattering length a=(5.08±1.06×10-9)m=(96±20)a0 of Cr52. This is fully consistent with our previous measurements on the basis of Feshbach resonances and therefore confirms the validity of the theoretical approach used to describe the dipolar Bose-Einstein condensate.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 97 (25)      Pages from: 250402-1  to: 250402-4

KeyWords: Hydrodynamics; Magnetic moments; Magnetism; Mathematical models; Resonance; Velocity measurement, Bose-Einstein condensate; Hydrodynamic equations; Magnetic dipole-dipole interactions, Gas condensates
DOI: 10.1103/PhysRevLett.97.250402

Citations: 113
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