scholarly journals The effects of the next-nearest-neighbour density–density interaction in the atomic limit of the extended Hubbard model

2011 ◽  
Vol 23 (24) ◽  
pp. 249802 ◽  
Author(s):  
Konrad Kapcia ◽  
Stanislaw Robaszkiewicz
Keyword(s):  
Hubbard Model ◽  
Nearest Neighbour ◽  
Extended Hubbard Model ◽  
Atomic Limit

Correlation Effects of Third-order Perturbation in the Extended Hubbard Model

1989 ◽  
Vol 42 (5) ◽  
pp. 565
Author(s):  
CZ Wei ◽  
HQ Nie ◽  
L Li ◽  
KY Zhang
Keyword(s):  
Hubbard Model ◽  
Electron Correlation ◽  
Spin Correlation ◽  
Order Perturbation ◽  
Atomic Electron ◽  
Nearest Neighbour ◽  
Extended Hubbard Model ◽  
Third Order ◽  
The Third ◽  
Significant Correction

Using the local approach, we have performed a third�order perturbation calculation to investigate the effects of intra-atomic electron correlation and electron and spin correlation between nearest neighbour sites in the extended Hubbard model. We found that significant correction of the third order over the second order results and, in comparison with the results of the third-order perturbation where only the intra-atomic electron correlation is included, the influence of the electron and spin correlation between nearest neighbour sites on the correlation energy is non-negligible.

scholarly journals The staggered charge-order phase of the extended Hubbard model in the atomic limit

1996 ◽  
Vol 29 (4) ◽  
pp. 733-747 ◽  
Author(s):  
Christian Borgs ◽  
Janusz Jedrzejewski ◽  
Roman Kotecký
Keyword(s):  
Hubbard Model ◽  
Charge Order ◽  
Extended Hubbard Model ◽  
Atomic Limit
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