Physics – Condensed Matter – Quantum Gases
Scientific paper
2011-01-31
Eur. Phys. J. D 65, 67 (2011)
Physics
Condensed Matter
Quantum Gases
16 pages, 21 figures. Submitted to EPJD, EuroQUAM special issue "Cold Quantum Matter - Achievements and Prospects"
Scientific paper
10.1140/epjd/e2011-20071-x
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.
Levinsen Jesper
Petrov D. S.
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