Orbital order in two-orbital hubbard model

Kojiro Honkawa, Seiichiro Onari

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In strongly correlated multiorbital systems, various ordered phases appear. In particular, the orbital order in iron-based superconductors attracts much attention since it is considered to be the origin of the nematic state. To clarify the essential conditions for realizing orbital orders, we study the simple two-orbital ðdxz; dyzÞ Hubbard model. We find that the orbital order, which corresponds to the nematic order, appears due to the vertex corrections even in the two-orbital model. Thus, the dxy orbital is not essential to realize the nematic orbital order. The obtained orbital order is determined by the orbital dependence and the topology of Fermi surfaces. We also find that another type of orbital order, which is rotated 45°, appears in a heavily hole-doped case.

Original languageEnglish
Article number034703
JournalJournal of the Physical Society of Japan
Volume87
Issue number3
DOIs
Publication statusPublished - Jan 1 2018

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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