2003/01/10 by Michael Potthoff · 1 citation
Chemistry · Physics and Astronomy · #Advanced Chemical Physics Studies #Advanced Physical and Chemical Molecular Interactions #Surface and Thin Film Phenomena #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1140/epjb/e2003-00121-8
published as Eur. Phys. J. B 32, 429 (2003) · 8 pages, 5 figures
arxiv created 2003/01/10 · openalex publication_date 2003/04/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The grand potential of a system of interacting electrons is considered as a stationary point of a self-energy functional. It is shown that a rigorous evaluation of the functional is possible for self-energies that are representable within a certain reference system. The variational scheme allows to construct new non-perturbative and thermodynamically consistent approximations. Numerical results illustrate the practicability of the method.