Manifestation of the Upper Hubbard band in the 2D Hubbard model at low electron density

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