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 paramete...
Збережено в:
| Дата: | 2018 |
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| Автори: | , |
| Формат: | Стаття |
| Мова: | English |
| Опубліковано: |
Інститут фізики конденсованих систем НАН України
2018
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| Назва видання: | Condensed Matter Physics |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/157113 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | 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. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| Резюме: | 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 for which the Heisenberg
model satisfactorily reproduces the two-orbital Hubbard model. Then we examined how the spectrum evolves
when we are outside of this region, focusing especially on checking of how it is modified when various ways of
interatomic hoppings of electrons between different orbitals are taken into account. We finally show how these
modifications affect the dependence of specific heat on temperature. |
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