Phase diagram regions deduced for strongly correlated systems via unitary transformation

From known phase diagram regions of different model Hamiltonians describing strongly correlated systems we deduced new domains of the ground state pha se diagram of the same models by a unitary transformation. Different types of extended Hubbard Hamiltonians were used for the starting point and the e xistence of new stable spin-density waves, charge-density waves, ferromagne tic states and a paramagnetic insulator is demonstrated. The procedure used is dimension independent. The ground state phase diagrams of several stron gly correlated systems modelled by extended Hubbard-like Hamiltonians are a nalysed using unitary transformations. New stable spin-density wave, charge -density wave, ferromagnetic or paramagnetic insulator phases are obtained in different cases. The results are true in any dimensions.