Weakly bound dimers of fermionic atoms

Abstract

We discuss the behavior of weakly bound bosonic dimers formed in a cold Fermi gas at a large positive scattering length $a$ for the interspecies interaction. We find the exact solution for the dimer-dimer elastic scattering and obtain a strong decrease of their collisional relaxation and decay with increasing $a$. The large ratio of the elastic to inelastic rate is promising for achieving Bose-Einstein condensation of the dimers and cooling the condensed gas to very low temperatures.

4 pages, no figures

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• Optimal conversion of Bose condensed atoms into molecules via a Feshbach resonance
• Many-body perturbation theory for strongly correlated effective Hamiltonians using effective field theory methods
• Quantum simulation of the Hubbard model with ultracold fermions in optical lattices
• Cold Atoms in Driven Optical Lattices
• Nonperturbative Renormalisation Group: Applications to the few and many-body systems
• Collisional scattering of strongly interacting D-band Feshbach molecules in optical lattices
• Molecular regimes in ultracold Fermi gases
• Negative Echo in the Density Evolution of Ultracold Fermionic Gases
• Emergent Thermalization Thresholds in Unitary Dynamics of Inhomogeneously Disordered Quantum Systems
• Interplay of the pseudogap and the BCS gap for heteropairs in ${}^{40}$K-${}^6$Li mixture
• Recombination in the universal four-fermion system
• Mechanisms of anomalous three-body loss in a population-imbalanced three-component Fermi gas
• Lellouch-Lüscher relation for ultracold few-atom systems under confinement