Phase diagram regions deduced for strongly correlated systems via unitary transformation

Endre Kovács, Z. Gulácsi

Research output: Contribution to journalArticle

3 Citations (Scopus)

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 languageEnglish
Pages (from-to)341-358
Number of pages18
JournalPhilosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties
Volume81
Issue number3
DOIs
Publication statusPublished - Mar 2001

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Systems (metallurgical)
Hamiltonians
Phase diagrams
Spin density waves
Charge density waves
phase diagrams
Ground state
insulators
ground state

ASJC Scopus subject areas

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

Cite this

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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.

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