Two-orbital Hubbard model vs spin S=1 Heisenberg model: studies on clusters

• Published in: Condensed Matter Physics
• Date: 2018
• Main Authors: Lemański, R., Matysiak, J.
• Format: Article
• Language: English
• Published: Інститут фізики конденсованих систем НАН України 2018
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/157113
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Two-orbital Hubbard model vs spin S=1 Heisenberg model: studies on clusters / R. Lemański, J. Matysiak // Condensed Matter Physics. — 2018. — Т. 21, № 3. — С. 33301: 1–8. — Бібліогр.: 15 назв. — англ.

We perform exact numeric calculations for the two-orbital Hubbard model on the four-site cluster. In the limit
 of large on-site coupling the model becomes equivalent to the spin S “ 1 Heisenberg model. By comparing
 energy spectra of these two models, we quantified the range of inte...