Orbital compass model as an itinerant electron system

J. Nasu, S. Ishihara

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The two-dimensional orbital compass model is studied as an interacting itinerant electron model. A Hubbard-type tight-binding model, from which the orbital compass model is derived in the strong-coupling limit, is identified. This model is analyzed by the random-phase approximation (RPA) and the self-consistent RPA methods from the weak coupling. Anisotropy for the orbital fluctuation in the momentum space is qualitatively changed by the on-site Coulomb interaction. This result is explained by the fact that the dominant fluctuation is changed from the intra-band nesting to the inter-band one by increasing the interaction.

Original languageEnglish
Article number27002
JournalEPL
Volume97
Issue number2
DOIs
Publication statusPublished - 2012 Jan
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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