Orbital Compass Model as an Itinerant Electron System
Strongly Correlated Electrons
2015-05-30 v1
Abstract
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.
Cite
@article{arxiv.1109.1417,
title = {Orbital Compass Model as an Itinerant Electron System},
author = {J. Nasu and S. Ishihara},
journal= {arXiv preprint arXiv:1109.1417},
year = {2015}
}
Comments
7 pages, 8 figures