An ansatz for the decoupling of the electron-propagator equation of motion via superoperator algebra
An alternative and direct procedure for the decoupling of the electron-propagator equation of motion within the superoperator formalism is presented. The present approach, based on inversion of the perturbation series for the (energy) Green's function, does not require inner projection of the s...
| Autores principales: | , |
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| Publicado: |
1990
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00092614_v169_n3_p236_Bochicchio http://hdl.handle.net/20.500.12110/paper_00092614_v169_n3_p236_Bochicchio |
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| Sumario: | An alternative and direct procedure for the decoupling of the electron-propagator equation of motion within the superoperator formalism is presented. The present approach, based on inversion of the perturbation series for the (energy) Green's function, does not require inner projection of the superoperator resolvent or renormalization theory and it is shown to yield, through an appropriate partitioning of the operator space, the lower-order corrections (ring and ladder diagrams) to the Tamm-Dancoff approximation (TDA). © 1990. |
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