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.

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References in corpus (4)

• Orbital liquid in ferromagnetic manganites: The orbital Hubbard model for $e_g$ electrons
• Landau-Gutzwiller quasi-particles
• Exact analytic results for the Gutzwiller wave function with finite magnetization
• Gutzwiller variational theory for the Hubbard model with attractive interaction

Cited by in corpus (5)

• Equivalence of Gutzwiller and slave-boson mean-field theories for multi-band Hubbard models
• Antiferromagnetic order in multi-band Hubbard models for iron-pnictides
• Numerical minimisation of Gutzwiller energy functionals
• The time-dependent Gutzwiller theory for multi-band Hubbard models
• Orbital liquid in the $e_g$ orbital Hubbard model in $d=\infty$ dimensions