Comparing contact and dipolar interaction in a Bose-Einstein condensate

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dc.creatorGriesmaier, Axel
dc.creatorStuhler, Jürgen
dc.creatorKoch, Tobias
dc.creatorFattori, Marco
dc.creatorPfau, Tilman
dc.creatorGiovanazzi, Stefano
dc.date2006-08-07
dc.date.accessioned2026-07-07T07:40:07Z
dc.date.available2026-07-07T07:40:07Z
dc.descriptionWe have measured the relative strength $ε_dd$ 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 $ε_dd = 0.159\pm0.034$ 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.
dc.identifierhttps://arxiv.org/abs/cond-mat/0608171
dc.identifierhttp://arxiv.org/abs/cond-mat/0608171
dc.identifierPhysical Review Letters 97, 250402 (2006)
dc.identifierdoi:10.1103/PhysRevLett.97.250402
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/121686
dc.subjectOther Condensed Matter
dc.titleComparing contact and dipolar interaction in a Bose-Einstein condensate
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