Orbital order in degenerate Hubbard models

A variational study

J. Bünemann, K. Jávorne-Radnóczi, P. Fazekas, F. Gebhard

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We use the Gutzwiller variational many-body theory to investigate the stability of orbitally ordered states in a two-band Hubbard model without spin degrees of freedom. Our results differ significantly from earlier Hartree-Fock calculations for this model. The Hartree-Fock phase diagram displays a large variety of orbital orders. In contrast, in the Gutzwiller approach orbital order only appears for densities in a narrow region around half filling.

Original languageEnglish
Article number326217
JournalJournal of Physics Condensed Matter
Volume19
Issue number32
DOIs
Publication statusPublished - Aug 15 2007

Fingerprint

Hubbard model
Phase diagrams
orbitals
degrees of freedom
phase diagrams

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Orbital order in degenerate Hubbard models : A variational study. / Bünemann, J.; Jávorne-Radnóczi, K.; Fazekas, P.; Gebhard, F.

In: Journal of Physics Condensed Matter, Vol. 19, No. 32, 326217, 15.08.2007.

Research output: Contribution to journalArticle

Bünemann, J. ; Jávorne-Radnóczi, K. ; Fazekas, P. ; Gebhard, F. / Orbital order in degenerate Hubbard models : A variational study. In: Journal of Physics Condensed Matter. 2007 ; Vol. 19, No. 32.
@article{548ff32263574998a0e11032235a5afa,
title = "Orbital order in degenerate Hubbard models: A variational study",
abstract = "We use the Gutzwiller variational many-body theory to investigate the stability of orbitally ordered states in a two-band Hubbard model without spin degrees of freedom. Our results differ significantly from earlier Hartree-Fock calculations for this model. The Hartree-Fock phase diagram displays a large variety of orbital orders. In contrast, in the Gutzwiller approach orbital order only appears for densities in a narrow region around half filling.",
author = "J. B{\"u}nemann and K. J{\'a}vorne-Radn{\'o}czi and P. Fazekas and F. Gebhard",
year = "2007",
month = "8",
day = "15",
doi = "10.1088/0953-8984/19/32/326217",
language = "English",
volume = "19",
journal = "Journal of Physics Condensed Matter",
issn = "0953-8984",
publisher = "IOP Publishing Ltd.",
number = "32",

}

TY - JOUR

T1 - Orbital order in degenerate Hubbard models

T2 - A variational study

AU - Bünemann, J.

AU - Jávorne-Radnóczi, K.

AU - Fazekas, P.

AU - Gebhard, F.

PY - 2007/8/15

Y1 - 2007/8/15

N2 - We use the Gutzwiller variational many-body theory to investigate the stability of orbitally ordered states in a two-band Hubbard model without spin degrees of freedom. Our results differ significantly from earlier Hartree-Fock calculations for this model. The Hartree-Fock phase diagram displays a large variety of orbital orders. In contrast, in the Gutzwiller approach orbital order only appears for densities in a narrow region around half filling.

AB - We use the Gutzwiller variational many-body theory to investigate the stability of orbitally ordered states in a two-band Hubbard model without spin degrees of freedom. Our results differ significantly from earlier Hartree-Fock calculations for this model. The Hartree-Fock phase diagram displays a large variety of orbital orders. In contrast, in the Gutzwiller approach orbital order only appears for densities in a narrow region around half filling.

UR - http://www.scopus.com/inward/record.url?scp=34547344308&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34547344308&partnerID=8YFLogxK

U2 - 10.1088/0953-8984/19/32/326217

DO - 10.1088/0953-8984/19/32/326217

M3 - Article

VL - 19

JO - Journal of Physics Condensed Matter

JF - Journal of Physics Condensed Matter

SN - 0953-8984

IS - 32

M1 - 326217

ER -