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. © 2004 Elsevier B.V. All rights reserved.

Self-energy corrections to the electronic spectrum of the Hubbard model

AVELLA, Adolfo;KRIVENKO, SERGEY;MANCINI, Ferdinando;
2004

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. © 2004 Elsevier B.V. All rights reserved.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/1064267
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