Approximate analytical dynamical mean-field approach to strongly correlated electron systems
An approximate analytical scheme of the dynamical mean-field theory (DMFT), that is used for electron systems with Hubbard correlations and is exact in the limit of the infinite dimensionality of a space, is developed. The effective single-site problem arising in the framework of this method is f...
Збережено в:
| Дата: | 2000 |
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| Автор: | |
| Формат: | Стаття |
| Мова: | English |
| Опубліковано: |
Інститут фізики конденсованих систем НАН України
2000
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| Назва видання: | Condensed Matter Physics |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/121033 |
| Теги: |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Approximate analytical dynamical mean-field approach to strongly correlated electron systems / I.V. Stasyuk // Condensed Matter Physics. — 2000. — Т. 3, № 2(22). — С. 437-456. — Бібліогр.: 27 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| Резюме: | An approximate analytical scheme of the dynamical mean-field theory
(DMFT), that is used for electron systems with Hubbard correlations and is
exact in the limit of the infinite dimensionality of a space, is developed. The
effective single-site problem arising in the framework of this method is formulated in terms of the auxiliary Fermi-field. The irreducible Green's function technique with the projecting on the Hubbard basis of Fermi-operators
is used for its solution. A system of DMFT equations is obtained in the
approximation which is a generalization of the Hubbard-III approximation
and combines it with a self-consistent renormalization of the local electron
levels. It is shown that the proposed approach includes as simple specific cases a number of known approximations (Hubbard-III, AA, MAA, . . . )
based on the assumption of the single-site structure of the electron self-
energy. |
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