Izvorni znanstveni članak
Ground state energy of 2D extended Hubbard model for finite size system with an exact diagonalization
S. Harir
; Laboratoire de Physique de la Matière Condensée, Faculté des Sciences Ben M'Sik, Université Hassan II-Mohammedia, Casablanca, Morocco
M. Bennai
; Laboratoire de Physique de la Matière Condensée, Faculté des Sciences Ben M'Sik, Université Hassan II-Mohammedia, Casablanca, Morocco; Groupement National de Physique des Hautes Energies, LabUFR-PHE, Rabat, Morocco
Y. Boughaleb
; Laboratoire de Physique de la Matière Condensée, Faculté des Sciences Ben M'Sik, Université Hassan II-Mohammedia, Casablanca, Morocco; LPMC, Faculté des Sciences d' El Jadida, Université Chouaib Doukkali, Morocco; Hassan II Academy of Sciences and Technology, Morocco
Sažetak
Using an exact analytical diagonalization for an extended Hubbard model, we study the first nearest-neighbour repulsion effect on the behaviour of a two-dimensional system of finite size at low density of electrons. The obtained results show that the introduction of the nearest-neighbour off-site interaction allows the correlation effects to become more remarkable and to play an essential role in the electron dynamics, and this off-site interaction encourages the formation of double occupancies.
Ključne riječi
extended Hubbard model; ground state; double occupation; gap energy
Hrčak ID:
302535
URI
Datum izdavanja:
1.7.2008.
Posjeta: 195 *