Issue |
EPL
Volume 97, Number 2, January 2012
|
|
---|---|---|
Article Number | 27002 | |
Number of page(s) | 6 | |
Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
DOI | https://doi.org/10.1209/0295-5075/97/27002 | |
Published online | 05 January 2012 |
Orbital compass model as an itinerant electron system
Department of Physics, Tohoku University - Sendai 980-8578, Japan
Received:
7
September
2011
Accepted:
29
November
2011
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.
PACS: 75.25.Dk – Orbital, charge, and other orders, including coupling of these orders / 75.10.Lp – Band and itinerant models / 75.47.Lx – Magnetic oxides
© EPLA, 2012
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.