Pentagon chain in external fields

György Kovács, Z. Gulácsi

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We consider a pentagon chain described by a Hubbard type of model considered under periodic boundary conditions. The system (i) is placed in an external magnetic field perpendicular to the plane of the cells, and (ii) is in a site-selective manner under the action of an external electric potential. In these conditions, we show in an exact manner that the physical properties of the system can be qualitatively changed. The changes cause first strong modifications of the band structure of the system created by the one-particle part of the Hamiltonian, and second, produce marked changes of the phase diagram. We exemplify this by deducing ferromagnetic ground states in the presence of external fields in two different domains of the parameter space.

Original languageEnglish
Pages (from-to)3674-3695
Number of pages22
JournalPhilosophical Magazine
Volume95
Issue number32
DOIs
Publication statusPublished - Nov 12 2015

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physical properties
phase diagrams
boundary conditions
ground state
causes
electric potential
cells
magnetic fields

Keywords

  • conducting polymers
  • correlated systems
  • exact results
  • ferromagnetism
  • Hubbard model
  • non-integrable systems
  • theoretical

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Pentagon chain in external fields. / Kovács, György; Gulácsi, Z.

In: Philosophical Magazine, Vol. 95, No. 32, 12.11.2015, p. 3674-3695.

Research output: Contribution to journalArticle

Kovács, György ; Gulácsi, Z. / Pentagon chain in external fields. In: Philosophical Magazine. 2015 ; Vol. 95, No. 32. pp. 3674-3695.
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