### 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, charge-density wave, ferromagnetic or paramagnetic insulator phases are obtained in different cases. The results are true in any dimensions.

Original language | English |
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Pages (from-to) | 341-358 |

Number of pages | 18 |

Journal | Philosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties |

Volume | 81 |

Issue number | 3 |

DOIs | |

Publication status | Published - Mar 2001 |

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### ASJC Scopus subject areas

- Chemical Engineering(all)
- Physics and Astronomy(all)

### Cite this

*Philosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties*,

*81*(3), 341-358. https://doi.org/10.1080/13642810010029391

**Phase diagram regions deduced for strongly correlated systems via unitary transformation.** / Kovács, Endre; Gulácsi, Z.

Research output: Contribution to journal › Article

*Philosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties*, vol. 81, no. 3, pp. 341-358. https://doi.org/10.1080/13642810010029391

}

TY - JOUR

T1 - Phase diagram regions deduced for strongly correlated systems via unitary transformation

AU - Kovács, Endre

AU - Gulácsi, Z.

PY - 2001/3

Y1 - 2001/3

N2 - 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, charge-density wave, ferromagnetic or paramagnetic insulator phases are obtained in different cases. The results are true in any dimensions.

AB - 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, charge-density wave, ferromagnetic or paramagnetic insulator phases are obtained in different cases. The results are true in any dimensions.

UR - http://www.scopus.com/inward/record.url?scp=0035297086&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035297086&partnerID=8YFLogxK

U2 - 10.1080/13642810010029391

DO - 10.1080/13642810010029391

M3 - Article

AN - SCOPUS:0035297086

VL - 81

SP - 341

EP - 358

JO - Philosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties

JF - Philosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties

SN - 1364-2812

IS - 3

ER -