Abstract:
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.
Similar content being viewed by others
Author information
Authors and Affiliations
Additional information
Received 13 January 2003 / Received in final form 5 March 2003 Published online 24 April 2003
Rights and permissions
About this article
Cite this article
Potthoff, M. Self-energy-functional approach to systems of correlated electrons. Eur. Phys. J. B 32, 429–436 (2003). https://doi.org/10.1140/epjb/e2003-00121-8
Issue Date:
DOI: https://doi.org/10.1140/epjb/e2003-00121-8