Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2004-11-06
Phys. Rev. B 71, 115104 (2005)
Physics
Condensed Matter
Other Condensed Matter
7 pages, 7 figures
Scientific paper
10.1103/PhysRevB.71.115104
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.
Chulkov Evgueni V.
Nechaev I. A.
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