Exact ground states for quasi 1D systems with hubbard interaction

E. Kovács, Z. Gulácsi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Using a positive semidefinite operator technique we deduced exact ground states for a modified diamond chain described by a non-integrable Hubbard model with on-site repulsion. Our results are valid for arbitrary length of the chain and strength of the Hubbard interaction. For the analyzed parameter space region of the quasi 1D chain structure we found that two flat bands are present in the bare band structure of the system, both for zero and for a fixed value of magnetic field. We obtained ground states of nonmagnetic and ferromagnetic insulator type and studied their physical properties.

Original languageEnglish
Article number01004
Pages (from-to)1-6
Number of pages6
JournalJournal of Nano- and Electronic Physics
Volume4
Issue number1
Publication statusPublished - 2012

Fingerprint

Ground state
Hubbard model
Diamond
ground state
Band structure
Diamonds
Physical properties
interactions
Magnetic fields
physical properties
diamonds
insulators
operators
magnetic fields

Keywords

  • Chain structures
  • Diamond chains
  • Exact solutions
  • Ferromagnetism
  • Hubbard model
  • Nanowires
  • Strongly interacting systems

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Radiation
  • Materials Science(all)

Cite this

Exact ground states for quasi 1D systems with hubbard interaction. / Kovács, E.; Gulácsi, Z.

In: Journal of Nano- and Electronic Physics, Vol. 4, No. 1, 01004, 2012, p. 1-6.

Research output: Contribution to journalArticle

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