Orbital Compass Model as an Itinerant Electron System

Details Orbital Compass Model as an Itinerant Electron System Orbital Compass Model as an Itinerant Electron System

2011-09-07

arxiv.org/abs/1109.1417v1

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 8 figures

Scientific paper

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.

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