Electron correlations in narrow energy bands: ground state energy and metal-insulator transition

• Published in: Condensed Matter Physics
• Date: 2000
• Main Authors: Didukh, L., Skorenkyy, Yu.
• Format: Article
• Language: English
• Published: Інститут фізики конденсованих систем НАН України 2000
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/120984
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Electron correlations in narrow energy bands: ground state energy and metal-insulator transition / L. Didukh, Yu. Skorenkyy // Condensed Matter Physics. — 2000. — Т. 3, № 4(24). — С. 787-798. — Бібліогр.: 27 назв. — англ.

The electron correlations in narrow energy bands are examined within the framework of the Hubbard model. The single-particle Green function and energy spectrum are obtained in a paramagnetic state at half-filling by means of a new two-pole approximation. Analytical expressions for the energy gap,...