1. Phase diagram regions deduced for strongly correlated systems via unitary transformation.
- Author
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Kovacs, Endre and Gulacsi, Zsolt
- Subjects
- *
PHASE diagrams , *HAMILTONIAN systems , *UNITARY transformations - Abstract
From known phase diagram regions of different model Hamiltonians describing strongly correlated systems we deduced new domains of the ground state phase diagram of the same models by a unitary transformation. Different types of extended Hubbard Hamiltonians were used for the starting point and the existence of new stable spin-density waves, charge-density waves, ferromagnetic states and a paramagnetic insulator is demonstrated. The procedure used is dimension independent. The ground state phase diagrams of several strongly correlated systems modelled by extended Hubbard-like Hamiltonians are analysed using unitary transformations. New stable spin-density wave, chargedensity wave, ferromagnetic or paramagnetic insulator phases are obtained in different cases. The results are true in any dimensions. [ABSTRACT FROM AUTHOR]
- Published
- 2001
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