scholarly journals Correlated wave functions and the absence of long-range order in numerical studies of the Hubbard model

1999 ◽  
Vol 59 (3) ◽  
pp. 1706-1711 ◽  
Author(s):  
M. Guerrero ◽  
G. Ortiz ◽  
J. E. Gubernatis
Keyword(s):  
Hubbard Model ◽  
Long Range ◽  
Wave Functions ◽  
Range Order ◽  
Long Range Order ◽  
Numerical Studies

scholarly journals Off-Diagonal Long-Range Order in Generalized Hubbard Models

1997 ◽  
Vol 11 (11) ◽  
pp. 1311-1335 ◽  
Author(s):  
Kristel Michielsen ◽  
Hans De Raedt
Keyword(s):  
Density Matrix ◽  
Hubbard Model ◽  
Long Range ◽  
Ground State ◽  
Size Dependence ◽  
State Energy ◽  
System Size ◽  
Range Order ◽  
Long Range Order ◽  
Hubbard Models

We present stochastic diagonalization results for the ground-state energy and the largest eigenvalue of the two-fermion density matrix of the BCS reduced Hamiltonian, the Hubbard model, and the Hubbard model with correlated hopping. The system-size dependence of this eigenvalue is used to study the existence of Off-Diagonal Long-Range Order in these models. We show that the model with correlated hopping and repulsive on-site interaction can exhibit Off-Diagonal Long-Range Order. Analytical results for some special limiting cases indicate that Off-Diagonal Long-Range Order not always implies superconductivity.

Ferrimagnetic long-range order of the Hubbard model

1994 ◽  
Vol 72 (8) ◽  
pp. 1280-1282 ◽  
Author(s):  
Shun-Qing Shen ◽  
Zhao-Ming Qiu ◽  
Guang-Shan Tian
Keyword(s):  
Hubbard Model ◽  
Long Range ◽  
Range Order ◽  
Long Range Order

Magnetic short-range order versus long-range order in the Hubbard model

1995 ◽  
Vol 52 (16) ◽  
pp. R11553-R11556 ◽  
Author(s):  
U. Trapper ◽  
D. Ihle ◽  
H. Fehske
Keyword(s):  
Hubbard Model ◽  
Long Range ◽  
Short Range ◽  
Short Range Order ◽  
Range Order ◽  
Long Range Order
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