Self-energy-functional approach to systems of correlated electrons
arXiv:cond-mat/0301137 · doi:10.1140/epjb/e2003-00121-8
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.
8 pages, 5 figures