Manifestation of the Upper Hubbard band in the 2D Hubbard model at low electron density
We consider the 2D Hubbard model in the strong-coupling case (U >> W) and at low electron density (nd² << 1). We find an antibound state as a pole in the two-particle T-matrix. The contribution of this pole in the self-energy reproduces a two-pole structure in the dressed one-par...
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| Опубліковано в: : | Физика низких температур |
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| Дата: | 2011 |
| Автори: | , , |
| Формат: | Стаття |
| Мова: | Англійська |
| Опубліковано: |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2011
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| Онлайн доступ: | https://nasplib.isofts.kiev.ua/handle/123456789/118762 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Manifestation of the Upper Hubbard band in the 2D Hubbard model at low electron density / M.Yu. Kagan, V.V. Val’kov, P. Woelfle // Физика низких температур. — 2011. — Т. 37, № 9-10. — С. 1046–1052. — Бібліогр.: 16 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1862547032167677952 |
|---|---|
| author | Kagan, M.Yu. Val’kov, V.V. Woelfle, P. |
| author_facet | Kagan, M.Yu. Val’kov, V.V. Woelfle, P. |
| citation_txt | Manifestation of the Upper Hubbard band in the 2D Hubbard model at low electron density / M.Yu. Kagan, V.V. Val’kov, P. Woelfle // Физика низких температур. — 2011. — Т. 37, № 9-10. — С. 1046–1052. — Бібліогр.: 16 назв. — англ. |
| collection | DSpace DC |
| container_title | Физика низких температур |
| description | We consider the 2D Hubbard model in the strong-coupling case (U >> W) and at low electron density (nd² << 1). We find an antibound state as a pole in the two-particle T-matrix. The contribution of this pole in the self-energy reproduces a two-pole structure in the dressed one-particle Green-function similar to the Hubbard-I approximation. We also discuss briefly the Engelbrecht-Randeria mode which corresponds to the pairing of two holes below the bottom of the band for U >> W and low electron density. Both poles produce nontrivial corrections to Landau Fermi-liquid picture already at low electron density but do not destroy it in 2D.
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| first_indexed | 2025-11-25T15:44:37Z |
| format | Article |
| fulltext | |
| id | nasplib_isofts_kiev_ua-123456789-118762 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0132-6414 |
| language | English |
| last_indexed | 2025-11-25T15:44:37Z |
| publishDate | 2011 |
| publisher | Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| record_format | dspace |
| spelling | Kagan, M.Yu. Val’kov, V.V. Woelfle, P. 2017-05-31T06:58:39Z 2017-05-31T06:58:39Z 2011 Manifestation of the Upper Hubbard band in the 2D Hubbard model at low electron density / M.Yu. Kagan, V.V. Val’kov, P. Woelfle // Физика низких температур. — 2011. — Т. 37, № 9-10. — С. 1046–1052. — Бібліогр.: 16 назв. — англ. 0132-6414 PACS: 71.10.Fd https://nasplib.isofts.kiev.ua/handle/123456789/118762 We consider the 2D Hubbard model in the strong-coupling case (U >> W) and at low electron density (nd² << 1). We find an antibound state as a pole in the two-particle T-matrix. The contribution of this pole in the self-energy reproduces a two-pole structure in the dressed one-particle Green-function similar to the Hubbard-I approximation. We also discuss briefly the Engelbrecht-Randeria mode which corresponds to the pairing of two holes below the bottom of the band for U >> W and low electron density. Both poles produce nontrivial corrections to Landau Fermi-liquid picture already at low electron density but do not destroy it in 2D. We acknowledge helpful discussions with P.B. Wiegman, D. Vollhardt, P. Fulde, K.I. Kugel, and A.F. Barabanov.
 This work was supported by RFBR grants №11-02-00798 and 11-02-00741. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Низкоразмерные структуры Manifestation of the Upper Hubbard band in the 2D Hubbard model at low electron density Article published earlier |
| spellingShingle | Manifestation of the Upper Hubbard band in the 2D Hubbard model at low electron density Kagan, M.Yu. Val’kov, V.V. Woelfle, P. Низкоразмерные структуры |
| title | Manifestation of the Upper Hubbard band in the 2D Hubbard model at low electron density |
| title_full | Manifestation of the Upper Hubbard band in the 2D Hubbard model at low electron density |
| title_fullStr | Manifestation of the Upper Hubbard band in the 2D Hubbard model at low electron density |
| title_full_unstemmed | Manifestation of the Upper Hubbard band in the 2D Hubbard model at low electron density |
| title_short | Manifestation of the Upper Hubbard band in the 2D Hubbard model at low electron density |
| title_sort | manifestation of the upper hubbard band in the 2d hubbard model at low electron density |
| topic | Низкоразмерные структуры |
| topic_facet | Низкоразмерные структуры |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/118762 |
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