Atom-dimer and dimer-dimer scattering in fermionic mixtures near a narrow Feshbach resonance
Identifieur interne : 004778 ( PascalFrancis/Curation ); précédent : 004777; suivant : 004779Atom-dimer and dimer-dimer scattering in fermionic mixtures near a narrow Feshbach resonance
Auteurs : J. Levinsen [Royaume-Uni, France] ; D. S. Petrov [France, Russie]Source :
- The European physical journal. D, Atomic, molecular and optical physics : (Print) [ 1434-6060 ] ; 2011.
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Abstract
We develop a diagrammatic approach for solving few-body problems in heteronuclear fermionic mixtures near a narrow interspecies Feshbach resonance. We calculate s-, p-, and d-wave phaseshifts for the scattering of an atom by a weakly-bound dimer. The fermionic statistics of atoms and the composite nature of the dimer lead to a strong angular momentum dependence of the atom-dimer interaction, which manifests itself in a peculiar interference of the scattered s- and p-waves. This effect strengthens with the mass ratio and is remarkably pronounced in 40K-(40K-6Li) atom-dimer collisions. We calculate the scattering length for two dimers formed near a narrow interspecies resonance. Finally, we discuss the collisional relaxation of the dimers to deeply bound states and evaluate the corresponding rate constant as a function of the detuning and collision energy.
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<front><div type="abstract" xml:lang="en">We develop a diagrammatic approach for solving few-body problems in heteronuclear fermionic mixtures near a narrow interspecies Feshbach resonance. We calculate s-, p-, and d-wave phaseshifts for the scattering of an atom by a weakly-bound dimer. The fermionic statistics of atoms and the composite nature of the dimer lead to a strong angular momentum dependence of the atom-dimer interaction, which manifests itself in a peculiar interference of the scattered s- and p-waves. This effect strengthens with the mass ratio and is remarkably pronounced in <sup>40</sup>
K-(<sup>40</sup>
K-<sup>6</sup>
Li) atom-dimer collisions. We calculate the scattering length for two dimers formed near a narrow interspecies resonance. Finally, we discuss the collisional relaxation of the dimers to deeply bound states and evaluate the corresponding rate constant as a function of the detuning and collision energy.</div>
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