Effects of two-site composite excitations in the Hubbard model

Details Effects of two-site composite excitations in the Hubbard model Effects of two-site composite excitations in the Hubbard model

2004-01-07

arxiv.org/abs/cond-mat/0401083v1

J. Magn. Magn. Mater. 272, E311 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

2 pages, 1 figure

Scientific paper

10.1016/j.jmmm.2003.12.1206

The electronic states of the Hubbard model are investigated by use of the Composite Operator Method. In addition to the Hubbard operators, two other operators related with two-site composite excitations are included in the basis. Within the present formulation, higher-order composite excitations are reduced to the chosen operatorial basis by means of a procedure preserving the particle-hole symmetry. The positive comparison with numerical simulations for the double occupancy indicates that such approximation improves over the two-pole approximation.

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