Hartree-Fock Theory of the Dimerized Peierls-Extended-Hubbard Model

1999 ◽  
Vol 214 (2) ◽  
pp. 343-351
Author(s):  
J. Mertsching
Keyword(s):  
Hubbard Model ◽  
Extended Hubbard Model ◽  
Hartree Fock

Ground state of the half-filled extended Hubbard model beyond the Hartree-Fock approximation

1984 ◽  
Vol 102 (7) ◽  
pp. 323-326 ◽  
Author(s):  
A.M. Oleś ◽  
R. Micnas ◽  
S. Robaszkiewicz ◽  
K.A. Chao
Keyword(s):  
Hubbard Model ◽  
Ground State ◽  
Extended Hubbard Model ◽  
Hartree Fock

Spin and Charge Density Waves in the Extended Hubbard Model: A Slave Boson Approach

1997 ◽  
Vol 11 (17) ◽  
pp. 2057-2074 ◽  
Author(s):  
S. Caprara ◽  
M. Avignon ◽  
D. D. Sarma
Keyword(s):  
Hubbard Model ◽  
Charge Density ◽  
Density Wave ◽  
Spin Density Wave ◽  
Nearest Neighbors ◽  
Charge Density Waves ◽  
Extended Hubbard Model ◽  
Hartree Fock ◽  
Charge Density Wave Phase ◽  
Half Filling

We use the extended Hubbard model to investigate the properties of the charge- and spin-density-wave phases in the presence of a nearest-neighbors repulsion term in the framework of the slave-boson technique. We show that, contrary to Hartree–Fock results, an instablity may occur for sufficiently high values of the Hubbard repulsion, both in the spin- and charge-density-wave phase, which makes the system discontinuously jump to a phase with a smaller or zero wave amplitude. The limits of applicability of our approach are discussed and our results are compared with previous numerical analysis. The phase diagram of the model at half-filling is determined.

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

scholarly journals Magnetic state of K0.8Fe1.6Se2from a five-orbital Hubbard model in the Hartree-Fock approximation

2011 ◽  
Vol 84 (14) ◽  
Author(s):  
Qinlong Luo ◽  
Andrew Nicholson ◽  
José Riera ◽  
Dao-Xin Yao ◽  
Adriana Moreo ◽  
...  
Keyword(s):  
Hubbard Model ◽  
Magnetic State ◽  
Hartree Fock
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