Some exact results for a degenerate Hubbard model in one dimension

Marcelo J. Rozenberg

E. M�ller-Hartmann

Marcelo J. Rozenberg

We obtain exact numerical solutions of the degenerate Hubbard model in the limit of large dimensions (or large lattice connectivity). Successive Mott-Hubbard metal insulator transitions at integer fillings occur at intermediate values of the interaction and low enough temperature in the paramagnetic phase. The results are relevant for transition metal oxides with partially filled narrow degenerate bands.

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.

P. Gluck

Dorota Jakubczyk