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Comparison of the Multi-Band Hubbard and Heisenberg Models on Small Finite Clusters.
- Source :
- Acta Physica Polonica: A; Mar2018, Vol. 133 Issue 3, p405-407, 3p
- Publication Year :
- 2018
-
Abstract
- 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 05874246
- Volume :
- 133
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Acta Physica Polonica: A
- Publication Type :
- Academic Journal
- Accession number :
- 128933868
- Full Text :
- https://doi.org/10.12693/APhysPolA.133.405