4-pole analysis of the two-dimensional Hubbard model

Details 4-pole analysis of the two-dimensional Hubbard model 4-pole analysis of the two-dimensional Hubbard model

2004-12-03

arxiv.org/abs/cond-mat/0412085v1

Physica B 359-361, 663 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

2pages, 1figure

Scientific paper

10.1016/j.physb.2005.01.174

The electronic states of the two-dimensional Hubbard model are investigated by means of a 4-pole approximation within the Composite Operator Method. In addition to the conventional Hubbard operators, we consider other two operators, which come from the hierarchy of the equations of motion. These operators carry information regarding surrounding spin and charge configurations. By means of this operatorial basis, we can study the physics related to the energy scale J=4t^2/U. Results present, in addition to the main two bands, a quasi-particle peak at the Fermi level, shadow bands and band flatness at (pi, 0) point.

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