Validity of t–J approximation for extended Hubbard model with strong repulsion

• Published in: Физика низких температур
• Date: 2018
• Main Authors: Cheranovskii, V.O., Klein, D.J., Ezerskaya, E.V., Tokarev, V.V.
• Format: Article
• Language: English
• Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2018
• Subjects: Специальный выпуск К 80-летию со дня рождения А.И. Звягина
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/176241
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Validity of t–J approximation for extended Hubbard model with strong repulsion / V.O. Cheranovskii, D.J. Klein, E.V. Ezerskaya, V.V. Tokarev// Физика низких температур. — 2018. — Т. 44, № 11. — С. 1622-1625. — Бібліогр.: 10 назв. — англ.

It is shown that for finite cyclic systems described by two band Hubbard Hamiltonian with strong electron repulsion the reduction to effective t–J model may give incorrect description of the ground state symmetry due to neglect of the correlated hopping terms.