A Feshbach resonance in d-wave collisions

Abstract

We analyse a narrow Feshbach resonance with ultra-cold chromium atoms colliding in d-wave. The resonance is made possible by dipole-dipole interactions, which couple an incoming $l=2$ collision channel with a bound molecular state with $l=0$. We find that three-body losses associated to this resonance increase with temperature, and that the loss feature width as a function of magnetic field also increases linearly with temperature. The analysis of our experimental data shows that the Feshbach coupling is small compared both to the temperature and to the density limited lifetime of the resonant bound molecular state. One consequence is that the three body losse rate is proportionnal to the square of the number of atoms, and that we can directly relate the amplitude of the losses to the Feshbach coupling parameter. We compare our measurement to a calculation of the coupling between the collisionnal channel and the molecular bound state by dipole-dipole interactions, and find a good agreement, with no adjustable parameter. An analysis of the loss lineshape is also performed, which enables to precisely measure the position of the resonance.

8 pages, 5 figures

References in corpus (12)

• Many-Body Physics with Ultracold Gases
• Bose-Einstein condensation of chromium
• Production of cold molecules via magnetically tunable Feshbach resonances
• Tuning p-wave interactions in an ultracold Fermi gas of atoms
• Control of Interaction-Induced Dephasing of Bloch Oscillations
• All-Optical Production of Chromium Bose-Einstein Condensates
• Atom interferometry with a weakly-interacting Bose Einstein condensate
• Observation of Feshbach resonances in an ultracold gas of ${}^{52}$Cr
• Interferometric determination of the s- and d-wave scattering amplitudes in ${}^{87}$Rb
• Tree-body loss of of trapped ultracold ${}^{87}$Rb atoms due to a Feshbach resonance
• Resonant Feshbach scattering of fermions in one-dimensional optical lattices
• Averaging out magnetic forces with fast rf-sweeps in an optical trap for metastable chromium atoms

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