  A less well known variant of the Nambu--Jona-Lasinio model with Nc colors and
U(2)L X U(2)R chiral symmetry is studied in 1+1 dimensions. Using
semi-classical methods appropriate for the large Nc limit, we determine the
vacuum manifold, the meson spectrum, massless and massive multi-fermion bound
states and the phase diagram as a function of temperature, chemical potential
and isospin chemical potential. An important tool to understand soliton
dynamics is the generalization of the time-dependent Hartree-Fock approach to
two flavors along the lines recently developed by Takahashi in the context of
unconventional fermionic superfluids and superconductors.
