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EnglishWe study the self-energy corrections to a 2-pole projection scheme for the Hubbard model by means of the self-consistent Born approximation, truncated to the first order, within the composite operator method. The bosonic Green's functions (spin and charge propagators), appearing in the mode-coupling decomposition, are computed by means of a 2-pole expansion in full self-consistency with the zero-order 2-pole fermionic propagator. The effects of spin fluctuations on the band structure are analyzed and discussed in relation to numerical simulation results.
http://hdl.handle.net/11386/1064335| Titolo: | SCBA within Composite Operator Method for the Hubbard model |
| Autori interni: | KRIVENKO, SERGEY AVELLA, Adolfo MANCINI, Ferdinando |
| Data di pubblicazione: | 2005 |
| Rivista: | PHYSICA. B, CONDENSED MATTER |
| Abstract: | We study the self-energy corrections to a 2-pole projection scheme for the Hubbard model by means of the self-consistent Born approximation, truncated to the first order, within the composite operator method. The bosonic Green's functions (spin and charge propagators), appearing in the mode-coupling decomposition, are computed by means of a 2-pole expansion in full self-consistency with the zero-order 2-pole fermionic propagator. The effects of spin fluctuations on the band structure are analyzed and discussed in relation to numerical simulation results. |
| Handle: | http://hdl.handle.net/11386/1064335 |
| Appare nelle tipologie: | 1.1.2 Articolo su rivista con ISSN |
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