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High-order correlation effects in the two-dimensional Hubbard model
Satoru Odashima, Adolfo Avella, Ferdinando Mancini
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…
4-pole analysis of the two-dimensional Hubbard model
Satoru Odashima, Adolfo Avella, Ferdinando Mancini
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…
Effects of two-site composite excitations in the Hubbard model
A. Avella, F. Mancini, S. Odashima
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…