Phase separation in the 1-D extended Hubbard model

1997 ◽  
Vol 282-287 ◽  
pp. 1875-1876 ◽  
Author(s):  
H.Q. Lin ◽  
E. Gagliano ◽  
D.K. Campbell
Keyword(s):  
Phase Separation ◽  
Hubbard Model ◽  
Extended Hubbard Model

On the possibility of phase separation in the extended Hubbard model

1990 ◽  
Vol 76 (12) ◽  
pp. 1333-1336 ◽  
Author(s):  
H. Fehske ◽  
V. Waas ◽  
H. Röder ◽  
H. Büttner
Keyword(s):  
Phase Separation ◽  
Hubbard Model ◽  
Extended Hubbard Model

scholarly journals INHOMOGENEOUS d-WAVE SUPERCONDUCTIVITY AND ANTIFERROMAGNETISM IN A TWO-DIMENSIONAL EXTENDED HUBBARD MODEL WITH NEAREST-NEIGHBOR ATTRACTIVE INTERACTION

2007 ◽  
Vol 21 (10) ◽  
pp. 573-584 ◽  
Author(s):  
W. P. SU
Keyword(s):  
Phase Separation ◽  
Hubbard Model ◽  
Cuprate Superconductors ◽  
Nearest Neighbor ◽  
Minimum Energy ◽  
Mean Field Approximation ◽  
Attractive Interaction ◽  
Two Dimensional ◽  
Extended Hubbard Model ◽  
D Wave

To understand the interplay of d-wave superconductivity and antiferromagnetism, we consider a two-dimensional extended Hubbard model with nearest neighbor attractive interaction. The Hamiltonian is solved in the mean field approximation on a finite lattice. In the impurity-free case, the minimum energy solutions show phase separation as predicted previously based on free energy argument. The phase separation tendency implies that the system can be easily rendered inhomogeneous by a small external perturbation. Explicit solutions of a model including weak impurity potentials are indeed inhomogeneous in the spin-density-wave and d-wave pairing order parameters. Relevance of the results to the inhomogeneous cuprate superconductors is discussed.

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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