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EnglishA new approach to investigate the electronic spectrum of the Hubbard model is presented. The complex dynamics of the composite fields is taken into account self-consistently well beyond the mean-field approximation by means of the composite operator method in the framework of the projection techniques for the Green's functions. Corrections to the bare single-particle spectrum of original fermions are computed applying the self-consistent Born approximation to the self-energy usually neglected in the previously used two-pole approximation.
http://hdl.handle.net/11386/1064267| Titolo: | Self-energy corrections to the electronic spectrum of the Hubbard model |
| Autori interni: | AVELLA, Adolfo KRIVENKO, SERGEY MANCINI, Ferdinando |
| Data di pubblicazione: | 2004 |
| Rivista: | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS |
| Abstract: | A new approach to investigate the electronic spectrum of the Hubbard model is presented. The complex dynamics of the composite fields is taken into account self-consistently well beyond the mean-field approximation by means of the composite operator method in the framework of the projection techniques for the Green's functions. Corrections to the bare single-particle spectrum of original fermions are computed applying the self-consistent Born approximation to the self-energy usually neglected in the previously used two-pole approximation. |
| Handle: | http://hdl.handle.net/11386/1064267 |
| Appare nelle tipologie: | 1.1.2 Articolo su rivista con ISSN |
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