Variational solution of the T-matrix integral equation
Other Condensed Matter
2007-05-23 v2
Abstract
We present a variational solution of the T-matrix integral equation within a local approximation. This solution provides a simple form for the T matrix similar to Hubbard models but with the local interaction depending on momentum and frequency. By examining the ladder diagrams for irreducible polarizability, a connection between this interaction and the local-field factor is established. Based on the obtained solution, a form for the T-matrix contribution to the electron self-energy in addition to the GW term is proposed. In the case of the electron-hole multiple scattering, this form allows one to avoid double counting.
Cite
@article{arxiv.cond-mat/0411170,
title = {Variational solution of the T-matrix integral equation},
author = {I. A. Nechaev and E. V. Chulkov},
journal= {arXiv preprint arXiv:cond-mat/0411170},
year = {2007}
}
Comments
7 pages, 7 figures