Spectral functions in the hubbard model with half-filling

2004 ◽  
Vol 46 (8) ◽  
pp. 1469-1473 ◽  
Author(s):  
S. G. Ovchinnikov ◽  
E. I. Shneider
Keyword(s):  
Hubbard Model ◽  
Spectral Functions ◽  
Half Filling

scholarly journals Properties of the half-filled Hubbard model investigated by the strong coupling diagram technique

2015 ◽  
Vol 29 (14) ◽  
pp. 1550088 ◽  
Author(s):  
A. Sherman
Keyword(s):  
Hubbard Model ◽  
Strong Coupling ◽  
Magnetic Ordering ◽  
Mott Transition ◽  
Near Neighbor ◽  
Diagram Technique ◽  
Spectral Functions ◽  
Spin Correlations ◽  
Occupation Numbers ◽  
Half Filling

The equation for the electron Green's function of the fermionic Hubbard model, derived using the strong coupling diagram technique, is solved self-consistently for the near-neighbor form of the kinetic energy and for half-filling. In this case the Mott transition occurs at the Hubbard repulsion Uc ≈ 6.96t, where t is the hopping constant. The calculated spectral functions, density of states (DOS) and momentum distribution are compared with results of Monte Carlo simulations. A satisfactory agreement was found for U > Uc and for temperatures, at which magnetic ordering and spin correlations are suppressed. For U < Uc and lower temperatures the theory describes qualitatively correctly the positions and widths of spectral continua, variations of spectral shapes and occupation numbers with changing wave vector and repulsion. The locations of spectral maxima turn out to be close to the positions of δ-function peaks in the Hubbard-I approximation.

Study of the Hubbard model at half filling

2008 ◽  
Vol 154 (1) ◽  
pp. 52-63 ◽  
Author(s):  
Yu. A. Izyumov ◽  
N. I. Chashchin
Keyword(s):  
Hubbard Model ◽  
Half Filling

Phase diagram of an extended Hubbard model with correlated hopping at half filling

1995 ◽  
Vol 51 (19) ◽  
pp. 13774-13777 ◽  
Author(s):  
A. A. Aligia ◽  
Liliana Arrachea ◽  
E. R. Gagliano
Keyword(s):  
Phase Diagram ◽  
Hubbard Model ◽  
Extended Hubbard Model ◽  
Half Filling

Spectral functions for the 2D Hubbard model

1995 ◽  
Vol 99 (3-4) ◽  
pp. 305-310 ◽  
Author(s):  
M. U. Luchini ◽  
D. M. Edwards
Keyword(s):  
Hubbard Model ◽  
Spectral Functions

Class of variational singlet wave functions for the Hubbard model away from half filling

1989 ◽  
Vol 40 (13) ◽  
pp. 8939-8944 ◽  
Author(s):  
P. W. Anderson ◽  
B. S. Shastry ◽  
D. Hristopulos
Keyword(s):  
Hubbard Model ◽  
Wave Functions ◽  
Half Filling
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