Effect of the intersite Coulomb interaction in the extended Hubbard model

1992 ◽  
Vol 46 (6) ◽  
pp. 3668-3671 ◽  
Author(s):  
Mei-Rong Li ◽  
Yong-Jun Wang ◽  
Chang-De Gong
Keyword(s):  
Hubbard Model ◽  
Coulomb Interaction ◽  
Extended Hubbard Model ◽  
Intersite Coulomb Interaction

THERMODYNAMICS OF THE FERMI-LINEARIZED EXTENDED HUBBARD MODEL

1992 ◽  
Vol 06 (22) ◽  
pp. 3529-3541 ◽  
Author(s):  
ANDREA DANANI ◽  
ARIANNA MONTORSI ◽  
MARIO RASETTI
Keyword(s):  
Hubbard Model ◽  
Coulomb Interaction ◽  
Mean Field ◽  
Local Magnetic Moment ◽  
The Novel ◽  
Extended Hubbard Model ◽  
Site Cluster ◽  
The Mean ◽  
Two Phases

The fermi linearization scheme for a two-site cluster (dimer) is applied to the extended Hubbard model, including Coulomb interaction between nearest neighbour sites. The partition function and the order parameter, as well as the average double-occupation and local magnetic moment are evaluated. The theory is checked by extended numerical analysis, performed here in the homogeneous case, when pairing is zero, and deriving the explicit temperature and filling dependence of the above quantities. An interesting feature that emerges from such calculations is that the mean-field parameter characteristic of fermi-linearization is capable of describing two different phases, one of which is not present in the conventional Hubbard model. The order parameters corresponding to the two phases are explicitly derived. The novel phase can be ascribed to the n.n. Coulomb interaction, the role of whose strength V is analysed.

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.

PHASE DIAGRAM OF STRIPE ORDER IN THE EXTENDED HUBBARD MODEL

2000 ◽  
Vol 14 (29n31) ◽  
pp. 3508-3513 ◽  
Author(s):  
MASARU KATO
Keyword(s):  
Hubbard Model ◽  
Coulomb Interaction ◽  
Nearest Neighbor ◽  
Mean Field ◽  
Field Approximation ◽  
Square Lattice ◽  
Mean Field Approximation ◽  
Extended Hubbard Model ◽  
Stable States ◽  
Stripe Order

The extended Hubbard model with the nearest-neighbor Coulomb interaction on the square lattice is studied within the mean-field approximation. The stable states for 8×8 sites lattice with the periodic boundary condition and the electron filling n=0.875, as well as for 10×10 lattice and n=0.80, are obtained. For 8×8 lattice where quarter-filled straight stripe is expected because of the long-range Coulomb interaction, the cross stripe phases become stable.

Screened Coulomb interaction or Hubbard model?

1991 ◽  
Vol 177 (1-3) ◽  
pp. 578-584 ◽  
Author(s):  
Daniel C. Mattis ◽  
Douglas Henderson
Keyword(s):  
Hubbard Model ◽  
Coulomb Interaction

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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