Atom-dimer scattering and long-lived trimers in fermionic mixtures

Details Atom-dimer scattering and long-lived trimers in fermionic mixtures Atom-dimer scattering and long-lived trimers in fermionic mixtures

2009-07-31

arxiv.org/abs/0907.5523v2

Phys. Rev. Lett. 103, 153202 (2009)

Physics

Condensed Matter

Quantum Gases

4 pages, 2 figures, published version

Scientific paper

We consider a heteronuclear fermionic mixture on the molecular side of an interspecies Feshbach resonance and discuss atom-dimer scattering properties in uniform space and in the presence of an external confining potential, restricting the system to a quasi-2D geometry. We find that there is a peculiar atom-dimer p-wave resonance which can be tuned by changing the frequency of the confinement. Our results have implications for the ongoing experiments on Lithium-Potassium mixtures, where this mechanism allows for switching the p-wave interaction between a K atom and Li-K dimer from attractive to repulsive, and forming a weakly bound trimer with unit angular momentum. We show that such trimers are long-lived and the atom-dimer resonance does not enhance inelastic relaxation in the mixture, making it an outstanding candidate for studies of p-wave resonance effects in a many-body system.

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