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

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 interaction parameters f...

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Bibliographic Details

Published in:	Condensed Matter Physics
Main Authors:	R. Lemański, J. Matysiak
Format:	Article
Language:	English
Published:	Yukhnovskii Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine 2018-09-01
Subjects:	multi-orbital Hubbard model Heisenberg model magnetic molecules
Online Access:	https://doi.org/10.5488/CMP.21.33301