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

Abstract

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.

4 pages, 2 figures, published version

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• Calibration of Interaction Energy between Bose and Fermi Superfluids
• Efimov trimers under strong confinement
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• Exploring ultracold collisions in ${}^6$Li-${}^{53}$Cr Fermi mixtures: Feshbach resonances and scattering properties of a novel alkali-transition metal system
• The p-wave polaron
• On the Efimov Effect in Higher Partial Waves
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• Ultracold LiCr: a new pathway to quantum gases of paramagnetic polar molecules
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• Double-degenerate Fermi mixtures of ${}^6$Li and ${}^{53}$Cr atoms
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• Phase Equilibrium of Binary Mixtures in Mixed Dimensions
• Dipole-Mode Spectrum and Hydrodynamic Crossover in a Resonantly Interacting Two-Species Fermion Mixture
• Universal clusters in quasi-two-dimensional ultracold Fermi mixtures
• Induced p-wave Superfluidity in Imbalanced Fermi Gases in a Synthetic Gauge Field
• Mass-ratio condition for non-binding of three two-component particles with contact interactions