Self-consistent calculation of spin fluctuations for the two-dimensional Hubbard model and additional high-Tcpairing interaction

1994 ◽  
Vol 49 (10) ◽  
pp. 6869-6879 ◽  
Author(s):  
S. Wermbter
Keyword(s):  
Hubbard Model ◽  
Spin Fluctuations ◽  
Two Dimensional ◽  
Consistent Calculation ◽  
Self Consistent

scholarly journals Self-consistent effective Hamiltonian theory for fermionic many-body systems

2020 ◽  
pp. 2150019
Author(s):  
Xindong Wang ◽  
Hai-Ping Cheng
Keyword(s):  
Hubbard Model ◽  
Order Parameter ◽  
Cooper Pair ◽  
Effective Hamiltonian ◽  
Two Dimensional ◽  
Body System ◽  
Many Body ◽  
Hamiltonian Theory ◽  
Self Consistent ◽  
Many Body Systems

Using a separable many-body variational wavefunction, we formulate a self-consistent effective Hamiltonian theory for fermionic many-body system. The theory is applied to the two-dimensional (2D) Hubbard model as an example to demonstrate its capability and computational effectiveness. Most remarkably for the Hubbard model in 2D, a highly unconventional quadruple-fermion non-Cooper pair order parameter is discovered.

scholarly journals Tracking the Footprints of Spin Fluctuations: A MultiMethod, MultiMessenger Study of the Two-Dimensional Hubbard Model

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Thomas Schäfer ◽  
Nils Wentzell ◽  
Fedor Šimkovic ◽  
Yuan-Yao He ◽  
Cornelia Hille ◽  
...  
Keyword(s):  
Hubbard Model ◽  
Spin Fluctuations ◽  
Two Dimensional
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