Self-energy-functional approach to systems of correlated electrons
Lehrstuhl Festkörpertheorie, Institut für Physik, Humboldt-Universität zu Berlin, 10115 Berlin, Germany
Corresponding author: a email@example.com
Revised: 5 March 2003
Published online: 24 April 2003
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.
PACS: 71.10.-w – Theories and models of many-electron systems / 71.15.-m – Methods of electronic structure calculations / 74.20.-z – Theories and models of superconducting state / 75.10.-b – General theory and models of magnetic ordering / 71.30.+h – Metal-insulator transitions and other electronic transitions
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2003