General result on charged and spin-excitation gaps in strongly correlated electron systems at half filling

1999 ◽  
Vol 60 (16) ◽  
pp. 11336-11344 ◽  
Author(s):  
Guang-Shan Tian ◽  
Lei-Han Tang
Keyword(s):  
General Result ◽  
Spin Excitation ◽  
Strongly Correlated Electron Systems ◽  
Strongly Correlated ◽  
Electron Systems ◽  
Strongly Correlated Electron ◽  
Correlated Electron Systems ◽  
Correlated Electron ◽  
Half Filling

scholarly journals SUPERCONDUCTING IN THE NEAR HALF-FILLING HUBBARD MODEL

1995 ◽  
Vol 09 (11n12) ◽  
pp. 711-717
Author(s):  
HOANG ANH TUAN ◽  
NGUYEN TOAN THANG ◽  
NGUYEN NGOC THUAN
Keyword(s):  
Hubbard Model ◽  
Functional Integral ◽  
Strongly Correlated Electron Systems ◽  
Strongly Correlated ◽  
Electron Systems ◽  
Strongly Correlated Electron ◽  
Correlated Electron Systems ◽  
Correlated Electron ◽  
Functional Integral Method ◽  
Half Filling

The Hubbard model of strongly correlated electron systems is considered near half-filling within the framework of a new functional integral method without slave bosons. A dynamical system of equations determining the superconducting phase of the Hubbard model is derived. Both singlet and triplet Cooper pairings are studied.

EXACTNESS OF FERMIONIC LINEARIZATION SCHEME WITH CLIFFORD VARIABLES IN d=∞

1995 ◽  
Vol 09 (16) ◽  
pp. 971-975 ◽  
Author(s):  
ARIANNA MONTORSI
Keyword(s):  
Exact Solution ◽  
Single Site ◽  
Strongly Correlated Electron Systems ◽  
Strongly Correlated ◽  
Electron Systems ◽  
Strongly Correlated Electron ◽  
Correlated Electron Systems ◽  
Correlated Electron

We show that the fermionic linearization scheme for dealing with strongly correlated electron systems — when implemented with Clifford variables — becomes exact in the d=∞ limit, at least for Hubbard-like models. In this case, the model is mapped exactly into a single-site problem. The conditions under which such a feature allows to obtain an exact solution are also discussed.

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