scholarly journals Charge and magnetic states for the Hubbard model on a three-site cluster

2006 ◽  
Vol 10 (3) ◽  
pp. 208-219
Author(s):  
O. P. Matveev ◽  
A. M. Shvaika
Keyword(s):  
Hubbard Model ◽  
Site Cluster ◽  
Magnetic States

scholarly journals Effect of electron correlations on the formation of spiral magnetic states in the two-dimensional t-t′ Hubbard model

JETP Letters ◽  
2013 ◽  
Vol 98 (3) ◽  
pp. 150-155 ◽  
Author(s):  
P. A. Igoshev ◽  
M. A. Timirgazin ◽  
A. K. Arzhnikov ◽  
V. Yu. Irkhin
Keyword(s):  
Hubbard Model ◽  
Two Dimensional ◽  
Electron Correlations ◽  
Magnetic States

High-spin magnetic states in the two-orbital Hubbard model on a tetrahedron

2008 ◽  
Vol 20 (46) ◽  
pp. 465216 ◽  
Author(s):  
Alfonso Romano ◽  
Canio Noce ◽  
Maria Emilia Amendola
Keyword(s):  
Hubbard Model ◽  
High Spin ◽  
Magnetic States

THERMODYNAMICS OF THE FERMI-LINEARIZED EXTENDED HUBBARD MODEL

1992 ◽  
Vol 06 (22) ◽  
pp. 3529-3541 ◽  
Author(s):  
ANDREA DANANI ◽  
ARIANNA MONTORSI ◽  
MARIO RASETTI
Keyword(s):  
Hubbard Model ◽  
Coulomb Interaction ◽  
Mean Field ◽  
Local Magnetic Moment ◽  
The Novel ◽  
Extended Hubbard Model ◽  
Site Cluster ◽  
The Mean ◽  
Two Phases

The fermi linearization scheme for a two-site cluster (dimer) is applied to the extended Hubbard model, including Coulomb interaction between nearest neighbour sites. The partition function and the order parameter, as well as the average double-occupation and local magnetic moment are evaluated. The theory is checked by extended numerical analysis, performed here in the homogeneous case, when pairing is zero, and deriving the explicit temperature and filling dependence of the above quantities. An interesting feature that emerges from such calculations is that the mean-field parameter characteristic of fermi-linearization is capable of describing two different phases, one of which is not present in the conventional Hubbard model. The order parameters corresponding to the two phases are explicitly derived. The novel phase can be ascribed to the n.n. Coulomb interaction, the role of whose strength V is analysed.

Predominant magnetic states in the Hubbard model on anisotropic triangular lattices

2008 ◽  
Vol 77 (21) ◽  
Author(s):  
T. Watanabe ◽  
H. Yokoyama ◽  
Y. Tanaka ◽  
J. Inoue
Keyword(s):  
Hubbard Model ◽  
Triangular Lattices ◽  
Magnetic States

scholarly journals Magnetic states of the five-orbital Hubbard model for one-dimensional iron-based superconductors

2014 ◽  
Vol 90 (3) ◽  
Author(s):  
Qinlong Luo ◽  
Kateryna Foyevtsova ◽  
German D. Samolyuk ◽  
Fernando Reboredo ◽  
Elbio Dagotto
Keyword(s):  
Hubbard Model ◽  
Iron Based Superconductors ◽  
One Dimensional ◽  
Iron Based ◽  
Magnetic States

HOLE-HOLE CORRELATIONS IN THE 2D HUBBARD MODEL

1991 ◽  
Vol 05 (01n02) ◽  
pp. 143-151 ◽  
Author(s):  
S. Sorella ◽  
A. Parola ◽  
E. Tosatti
Keyword(s):  
Monte Carlo ◽  
Correlation Function ◽  
Monte Carlo Simulations ◽  
Hubbard Model ◽  
Weak Coupling ◽  
Short Range ◽  
Hard Core ◽  
Short Range Repulsion ◽  
Theoretical Predictions ◽  
Site Cluster

The hole-hole correlation function in the 2D Hubbard model is investigated in the low doping regime both via Monte Carlo simulations for U=4 and Lanczos diagonalization on a 16 site cluster for very large U. The results are compared with available theoretical predictions for the strong coupling limit. There is a clear short range repulsion, but no signature of hole-hole attraction is found in either case. At U=4 correlations are still remarkably weak-coupling-like. For large U, they become rather similar to those of hard core bosons.

ELECTRONIC AND MAGNETIC STATES OF ULTRA-THIN Fe FILMS

1984 ◽  
Vol 45 (C5) ◽  
pp. C5-371-C5-371 ◽  
Author(s):  
A. Amiri-Hezaveh ◽  
G. Jennings ◽  
D. J. Joyner ◽  
R. F. Willis
Keyword(s):  
Magnetic States
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