Nonlocal correlations induced by Hund's coupling: A cluster DMFT study

Yusuke Nomura, Shiro Sakai, Ryotaro Arita

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

We study spatial correlation effects in multiorbital systems, especially in a paramagnetic metallic state subject to Hund's coupling. We apply a cluster extension of the dynamical mean-field theory (DMFT) to the three-orbital Hubbard model away from half filling, where previous single-site DMFT studies revealed that local correlation effects caused by Hund's coupling bring about unusual strongly correlated metallic behaviors. We find that Hund's coupling significantly affects the nonlocal correlations too; it strongly modulates the electron distribution in the momentum space so as to make a momentum region almost half filled and hence strongly correlated. It leads to an anomalous electronic state distinct both from the Fermi liquid and the Mott insulator. We identify the mechanism of the anomalous state with the intersite ferromagnetic correlations induced by Hund's coupling.

Original languageEnglish
Article number235107
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number23
DOIs
Publication statusPublished - 2015 Jun 5
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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