Non-perturbative construction of the Luttinger-Ward functional
For a system of correlated electrons, the Luttinger-Ward functional provides a link between static thermodynamic quantities on the one hand and single-particle excitations on the other. The functional is useful in deriving several general properties of the system as well as in formulating the ther...
Збережено в:
| Дата: | 2006 |
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| Автор: | |
| Формат: | Стаття |
| Мова: | English |
| Опубліковано: |
Інститут фізики конденсованих систем НАН України
2006
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| Назва видання: | Condensed Matter Physics |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/121360 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Non-perturbative construction of the Luttinger-Ward functional / M. Potthoff // Condensed Matter Physics. — 2006. — Т. 9, № 3(47). — С. 557–567. — Бібліогр.: 31 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| Резюме: | For a system of correlated electrons, the Luttinger-Ward functional provides a link between static thermodynamic
quantities on the one hand and single-particle excitations on the other. The functional is useful in
deriving several general properties of the system as well as in formulating the thermodynamically consistent
approximations. Its original construction, however, is perturbative as it is based on the weak-coupling
skeleton-diagram expansion. Here, it is shown that the Luttinger-Ward functional can be derived within a general
functional-integral approach. This alternative and non-perturbative approach stresses the fact that the
Luttinger-Ward functional is universal for a large class of models. |
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