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dc.contributor.author |
Kagan, M.Yu. |
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dc.contributor.author |
Val’kov, V.V. |
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Woelfle, P. |
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dc.date.accessioned |
2017-05-31T06:58:39Z |
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dc.date.available |
2017-05-31T06:58:39Z |
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dc.date.issued |
2011 |
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dc.identifier.citation |
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. |
uk_UA |
dc.identifier.issn |
0132-6414 |
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dc.identifier.other |
PACS: 71.10.Fd |
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dc.identifier.uri |
http://dspace.nbuv.gov.ua/handle/123456789/118762 |
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dc.description.abstract |
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. |
uk_UA |
dc.description.sponsorship |
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. |
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dc.language.iso |
en |
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dc.publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
uk_UA |
dc.relation.ispartof |
Физика низких температур |
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dc.subject |
Низкоразмерные структуры |
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dc.title |
Manifestation of the Upper Hubbard band in the 2D Hubbard model at low electron density |
uk_UA |
dc.type |
Article |
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dc.status |
published earlier |
uk_UA |
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