Phase diagram regions deduced for strongly correlated systems via unitary transformation

Endre Kovács, Zsolt Gulácsi

Research output: Contribution to journalArticle

3 Citations (Scopus)


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
Issue number3
Publication statusPublished - Mar 2001

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Phase diagram regions deduced for strongly correlated systems via unitary transformation'. Together they form a unique fingerprint.

  • Cite this