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SUMMARY:Atom-dimer and dimer-dimer scattering in fermionic mixtures near a
  narrow Feshbach resonance - Jesper Levinsen\, University of Cambridge
DTSTART:20110224T141500Z
DTEND:20110224T151500Z
UID:TALK29731@talks.cam.ac.uk
CONTACT:Joe Bhaseen
DESCRIPTION:We develop a diagrammatic approach for solving few-body proble
 ms in heteronuclear fermionic mixtures near a narrow interspecies Feshbach
  resonance. We calculate s-\, p-\, and d-wave phaseshifts for the scatteri
 ng of an atom by a weakly-bound dimer. The fermionic statistics of atoms a
 nd the composite nature of the dimer lead to a strong angular momentum dep
 endence of the atom-dimer interaction\, which manifests itself in a peculi
 ar interference of the scattered s- and p-waves. This effect strengthens w
 ith the mass ratio and is remarkably pronounced in 40K-(40K-6Li) atom-dime
 r collisions. We calculate the scattering length for two dimers formed nea
 r a narrow interspecies resonance. Finally\, we discuss the collisional re
 laxation of the dimers to deeply bound states and evaluate the correspondi
 ng rate constant as a function of the detuning and collision energy.\n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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