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EnglishThe 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=4t2/U. Results present, in addition to the two main bands, a quasi-particle peak at the Fermi level, shadow bands and band flatness at (π, 0) point.
| Titolo: | 4-pole analysis of the two-dimensional Hubbard model |
| Autori: | |
| Data di pubblicazione: | 2005 |
| Rivista: | |
| Abstract: | 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=4t2/U. Results present, in addition to the two main bands, a quasi-particle peak at the Fermi level, shadow bands and band flatness at (π, 0) point. |
| Handle: | http://hdl.handle.net/11386/1064304 |
| Appare nelle tipologie: | 1.1.2 Articolo su rivista con ISSN |
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