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

• Published in: Физика низких температур
• Date: 2011
• Main Authors: Kagan, M.Yu., Val’kov, V.V., Woelfle, P.
• Format: Article
• Language: English
• Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2011
• Subjects: Низкоразмерные структуры
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/118762
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: 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.

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 Gr...