Jmp. Carmelo et Nmr. Peres, SYMMETRIES AND PSEUDOPARTICLE TRANSFORMATIONS IN 1D NON-ABELIAN QUANTUM LIQUIDS, Journal of low temperature physics, 99(3-4), 1995, pp. 571-576
We consider the non-Abelian Hubbard chain in a magnetic field and chem
ical potential. We find that the set of different pseudoparticle types
which generate the ground state from the suitable vacuum transform in
the representation of the symmetry group U(1)circle times U(1), SU(2)
circle times U(1), U(1)circle times SU(2), or SO(4) of the correspondi
ng sector of parameter space.