Spin correlation effects on the bonding character of alkali/silicon interfaces: An extended Hubbard model

1993 ◽  
Vol 11 (5) ◽  
pp. 2483-2486 ◽  
Author(s):  
J. M. López‐Sancho ◽  
M. C. Refolio ◽  
M. P. López‐Sancho ◽  
J. Rubio
Keyword(s):  
Hubbard Model ◽  
Spin Correlation ◽  
Correlation Effects ◽  
Extended Hubbard Model

TWO-DIMENSIONAL QUARTER-FILLED EXTENDED HUBBARD MODEL AT STRONG COUPLING

2005 ◽  
Vol 19 (01n03) ◽  
pp. 213-216
Author(s):  
W. F. LEE ◽  
H. Q. LIN
Keyword(s):  
Hubbard Model ◽  
Correlation Functions ◽  
Nearest Neighbor ◽  
Spin Correlation ◽  
Perturbation Approach ◽  
Effective Hamiltonian ◽  
Two Dimensional ◽  
Extended Hubbard Model ◽  
Neighbor Interaction ◽  
Electron Hopping

In this paper, we generalized the perturbation approach to study the quasi-two-dimension extended Hubbard model. This model is characterizing by intra-chain electron hopping t, on-site Column interaction U, nearest-neighbor interaction V, and inter-chain electron hopping t′ and nearest-neighbor interaction V′. An effective Hamiltonian up to sixth-order in t/U, t/V, t/V′, t′/U, t′/V and t′/V′ expansion was obtained and the spin-spin correlation functions were calculated. We presented results for t=t′, V=V′.

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.

Quarter-Filled Extended Hubbard Model at Strong Coupling

2003 ◽  
Vol 17 (18n20) ◽  
pp. 3339-3342 ◽  
Author(s):  
W. F. Lee ◽  
H. Q. Lin
Keyword(s):  
Hubbard Model ◽  
Strong Coupling ◽  
Coulomb Interaction ◽  
State Energy ◽  
Nearest Neighbor ◽  
Spin Correlation ◽  
Perturbation Approach ◽  
Effective Hamiltonian ◽  
Extended Hubbard Model ◽  
One Dimensional

We apply a perturbation approach to study the quarter-filled extended Hubbard model at strong coupling limit. An effective Hamiltonian up to sixth order in t/U and t/V (t defines electron hopping, U defines on-site Coulomb interaction, and V defines nearest-neighbor Coulomb interaction) for one-dimensional chains was obtained. The spin-spin correlation functions were involved, which can be obtained after comparing to the ground state energy numerically obtained from the phase diagram.

Correlation effects in the extended Hubbard model

1988 ◽  
Vol 153 (1-3) ◽  
pp. 232-247 ◽  
Author(s):  
R. Taranko ◽  
E. Taranko
Keyword(s):  
Hubbard Model ◽  
Correlation Effects ◽  
Extended Hubbard Model

Stability ofs+id-Wave Pairing State in the 2-D Extended Hubbard Model

1995 ◽  
Vol 64 (3) ◽  
pp. 922-926 ◽  
Author(s):  
Hiroki Tsuchiura ◽  
Yukio Tanaka ◽  
Yasunari Ushijima
Keyword(s):  
Hubbard Model ◽  
Extended Hubbard Model ◽  
Pairing State ◽  
Wave Pairing
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