Authors: Kovacs E.; Gulacsi Z.

Source: Philosophical Magazine B, Volume 81, Number 3, 1 March 2001 , pp. 341-358(18)

Publisher: Taylor and Francis Ltd

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.

Language: English

Document Type: Research article

Publication date: 2001-03-01

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