Strongly interacting Fermi gases in the molecular

and unitarity regimes

 

G.V. Shlyapnikov ,

 

I will give an overview of recent studies of strongly interacting

(two-component) Fermi gases and focus on weakly bound homonuclear

molecules formed at a positive scattering length for the interatomic

interaction. They represent novel composite bosons which exhibit the

features of Fermi statistics at short intermolecular distances. In

particular, the Pauli exclusion principle for identical fermions provides

a strong suppression of relaxation of these molecules to deep bound states

and makes them remarkably stable, which pawes a way to their Bose-Einstein

condensation (BEC). I then analyze heteronuclear molecules expected in

mixtures of different fermionic atoms and address the problem of BEC and

superfluidity in these systems.