Molecular superfluid phase in one-dimensional multicomponent fermionic cold atoms

We study a simple model of N -component fermions with contact interactions which describes fermionic atoms with N = 2F + 1 hyperfine states loaded into a one-dimensional optical latt ice. We show by means of analytical and numerical approaches that, for attractiv e interaction, a quasi-long-range molecular superfluid phase emerges at low density. In such a phase, the pairing instability is strongly suppressed and the leading instability is formed from bound-states made of N fermions. At small density, the molecular superfluid phase i s generic and exists for a wide range of attractive contact int eractions without an SU(N ) symmetry between the hyperfine states.