A doubly degenerate Hubbard model in the strongly correlated limit

Claudine Lacroix, M. Cyrot

K. A. Chao, Józef Spałek, Andrzej M. Oleś

Claudine Lacroix, M. Cyrot

An exact solution for the one-dimensional doubly degenerate Hubbard model is obtained for the case of N+1 electrons in the limit of infinite coupling (U and J to infinity ). The density of states, conductivity, susceptibility and specific heat are calculated. The results are very different from that of the non-degenerate Hubbard chain due to degeneracy.

Miguel Lagos, Miguel Kiwi, R. Ramirez

P. Lombardo, G. Albinet

We have investigated electronic properties of the degenerate multi-orbital Hubbard model, in the limit of large spatial dimension. A new local model, including a doubly degenerate strongly correlated site has been introduced and solved in the framework of the non-crossing approximation (NCA). Mott-Hubbard transitions have been examined in details, including the calculation of Coulomb repulsion critical values and electronic densities of states for any regime of parameters.

Marcelo J. Rozenberg