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2018 | 133 | 3 | 405-407
Article title

Comparison of the Multi-Band Hubbard and Heisenberg Models on Small Finite Clusters

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Abstracts
EN
We perform exact numeric calculations for a few versions of the two-orbital Hubbard model on the four site cluster. We show that the conventional spin 1 Heisenberg Hamiltonian can be obtained in the strong coupling limit, but only for some versions of the two-orbital Hubbard model. Then we propose a modified version of the Heisenberg Hamiltonian, that we call the two-orbital Heisenberg model, which is relevant in those cases, where the conventional spin 1 Heisenberg model fails.
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Contributors
author
  • Institute of Low Temperature and Structure Research, Polish Academy of Science, Okólna 2, 50-422 Wrocław, Poland
author
  • Institute of Low Temperature and Structure Research, Polish Academy of Science, Okólna 2, 50-422 Wrocław, Poland
References
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Document Type
Publication order reference
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bwmeta1.element.bwnjournal-article-appv133n3p020kz
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