Excitation spectrum of the one-dimensional Hubbard model

1974 ◽  
Vol 9 (5) ◽  
pp. 2150-2158 ◽  
Author(s):  
Cornelius F. Coll
Keyword(s):  
Hubbard Model ◽  
Excitation Spectrum ◽  
One Dimensional ◽  
The One

scholarly journals Renormalization Group Approach to the One–Dimensional 1/4–Filled Hubbard Model with Alternating on–Site Interactions

1997 ◽  
Vol 11 (16) ◽  
pp. 1925-1936 ◽  
Author(s):  
G. Jackeli ◽  
G. Japaridze
Keyword(s):  
Renormalization Group ◽  
Hubbard Model ◽  
Excitation Spectrum ◽  
Nearest Neighbor ◽  
Coupling Constants ◽  
Antiferromagnetic Order ◽  
One Dimensional ◽  
Dynamical Generation ◽  
Renormalization Group Approach ◽  
The One

The one-dimensional Hubbard model with different on-site interactions is investigated by renormalization group technique. In the case of a 1/4-filled band the dynamical nonequivalence of sites leads to the appearance of Umklapp processes in the system, and to the dynamical generation of a gap in the charge excitation spectrum for Ua≠Ub, Ua>0 or Ub>0. The ground-state phase diagram is obtained in the limit of second order renormalization. Depending on the sign and relative values of the bare coupling constants, there is a gap in the spin or charge excitation spectrum, and the model system tends to superconducting or antiferromagnetic order at T=0, with doubled period. The role of interaction between particles on nearest and next-nearest neighbor sites is also considered.

scholarly journals Antiferromagnetic fluctuations in the one-dimensional Hubbard model

AIP Advances ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 125127
Author(s):  
Václav Janiš ◽  
Antonín Klíč ◽  
Jiawei Yan
Keyword(s):  
Hubbard Model ◽  
One Dimensional ◽  
The One
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