  We present an analysis of the phase space of cosmological models based on a
non minimal coupling between the geometry and a fermionic condensate. We obtain
that the strong constraint coming from the Dirac equations allows a detailed
design of the cosmology of these models and at the same time guarantees an
evolution towards a state indistinguishable from General Relativistic
cosmological models. In this light, we show how the use of some specific
potentials is able to reproduce naturally two de Sitter phases separated by a
power law expansion which could be an interesting model for the unification of
an inflationary phase and a dark energy era.
