Abstract.
An alternative theoretical approach to the polarization propagator based on a new finite expansion of a finite-dimensional matrix is presented. The general equations for such an expansion are derived and the validity conditions stated. This method is used to accomplish an approximate scheme for the self-energy of the particle–hole propagator within the superoperator formalism. Within this scheme each contribution includes corrections to infinite order in electronic interaction and so describes collective effects in a natural way. Individual contributions can be interpreted as describing the propagation of the interaction through a particular subset of electronic excitations. Comparison with other known approximation levels, such as the random-phase approximation, is also analyzed.
Similar content being viewed by others
Author information
Authors and Affiliations
Additional information
Received: 14 February 2000 / Accepted: 18 April 2000 / Published online: 18 August 2000
Rights and permissions
About this article
Cite this article
Cavasotto, C. Finite expansion of the inverse matrix in the polarization propagator method. Theor Chem Acc 104, 491–498 (2000). https://doi.org/10.1007/s002140000176
Issue Date:
DOI: https://doi.org/10.1007/s002140000176