scholarly journals Strong-coupling expansions for the pure and disordered Bose-Hubbard model

1996 ◽  
Vol 53 (5) ◽  
pp. 2691-2700 ◽  
Author(s):  
J. K. Freericks ◽  
H. Monien
Keyword(s):  
Hubbard Model ◽  
Strong Coupling ◽  
Strong Coupling Expansions

Weak- and strong-coupling expansions for the multi-band Hubbard model

1989 ◽  
Vol 162-164 ◽  
pp. 811-812
Author(s):  
J. Wagner ◽  
R. Putz ◽  
B. Ehlers ◽  
L. Lilly ◽  
A. Muramatsu ◽  
...  
Keyword(s):  
Hubbard Model ◽  
Strong Coupling ◽  
Strong Coupling Expansions ◽  
Multi Band

scholarly journals High-order symbolic strong-coupling expansion for the Bose-Hubbard model

2018 ◽  
Vol 98 (24) ◽  
Author(s):  
Tao Wang ◽  
Xue-Feng Zhang ◽  
Chun-Feng Hou ◽  
Sebastian Eggert ◽  
Axel Pelster
Keyword(s):  
Hubbard Model ◽  
Strong Coupling ◽  
Strong Coupling Expansion ◽  
High Order

Hubbard model in the strong-coupling approximation

1993 ◽  
Vol 47 (10) ◽  
pp. 6004-6009 ◽  
Author(s):  
B. M. Elrick ◽  
M. D. Kovarik ◽  
A. E. Jacobs ◽  
W. G. Macready
Keyword(s):  
Hubbard Model ◽  
Strong Coupling ◽  
Coupling Approximation ◽  
Strong Coupling Approximation

η-PAIRING SUPERCONDUCTIVITY IN THE NEGATIVE-U HUBBARD MODEL: EFFECT OF FLUCTUATIONS AND DISORDER

1994 ◽  
Vol 08 (15) ◽  
pp. 2041-2058
Author(s):  
JÜRGEN STEIN
Keyword(s):  
Phase Diagram ◽  
Asymptotic Expansion ◽  
Hubbard Model ◽  
Strong Coupling ◽  
Mean Field ◽  
Higher Order ◽  
Field Phase ◽  
Effective Pair ◽  
The Mean ◽  
Pair Hopping

We have studied the influence of singular fluctuations around the mean-field solution as well as higher order contributions to the geometry controlled asymptotic expansion of the propagators on η-pairing superconductivity in the strong coupling negative-U Hubbard model in the presence of unpaired electrons. The modifications of the mean-field results due to the introduction of disorder and allowance for finite U are also calculated. Besides the singularities already present in the O(2) nonlinear σ-model we find a filling-depending singular depression of the repulsive effective pair-hopping interaction which strongly alters the mean-field phase diagram and appears to suppress the η-pairing phase near the band edges.

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