2006/08/07 by Axel Griesmaier, J. Stühler, Jürgen Stuhler +6 · 2 citations
Physics and Astronomy · #Atomic and Subatomic Physics Research #Atomic physics #Bose–Einstein condensate #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Dipole #Magnetic dipole #Magnetic moment #Physics #Quantum electrodynamics #Quantum mechanics #Quantum, superfluid, helium dynamics #cond-mat.other
paper · pdf · doi:10.1103/physrevlett.97.250402
published as Physical Review Letters 97, 250402 (2006)
arxiv created 2006/08/07 · openalex publication_date 2006/12/21 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We have measured the relative strength \ensuremathεdd 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 \ensuremathεdd=0.159\ifmmode±\else\textpm\fi0.034. We use this result to determine the s-wave scattering length a=(5.08\ifmmode±\else\textpm\fi1.06\ifmmode×\else\texttimes\fi10^\ensuremath-9) m=(96\ifmmode±\else\textpm\fi20) a0 of 52Cr. 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.