Anisotropic two-orbital Hubbard model: Single-site versus cluster dynamical mean-field theory

H. Lee, Y. Z. Zhang, Harald Olaf Jeschke, R. Valentí

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The anisotropic two-orbital Hubbard model with different bandwidths and degrees of frustration in each orbital is investigated in the framework of both single-site dynamical mean-field theory (DMFT) as well as its cluster extension (DCA) for clusters up to four sites combined with a continuous-time quantum Monte Carlo algorithm. This model shows a rich phase diagram which includes the appearance of orbital selective phase transitions, non-Fermi liquid behavior as well as antiferromagnetic metallic states. We discuss the advantages and drawbacks of employing the single-site DMFT with respect to DCA and the consequences for the physical picture obtained out of these calculations. Finally, we argue that such a minimal model may be of relevance to understand the nature of the antiferromagnetic metallic state in the iron-pnictide superconductors as well as the origin of the small staggered magnetization observed in these systems. The anisotropic two-orbital Hubbard model with different bandwidths and degrees of frustration in each orbital is investigated in the framework of both single-site dynamical mean-field theory (DMFT) as well as its cluster extension (DCA) for clusters up to four sites combined with a continuous-time quantum Monte Carlo algorithm. This model shows a rich phase diagram which includes the appearance of orbital selective phase transitions, non-Fermi liquid behavior as well as antiferromagnetic metallic states.

Original languageEnglish
Pages (from-to)689-697
Number of pages9
JournalAnnalen der Physik (Leipzig)
Volume523
Issue number8-9
DOIs
Publication statusPublished - Aug 2011
Externally publishedYes

Keywords

  • Magnetism
  • iron-based superconductors.
  • multiorbital Hubbard model

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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