Self-energy-functional approach to systems of correlated electrons

Details Self-energy-functional approach to systems of correlated electrons Self-energy-functional approach to systems of correlated electrons

2003-01-10

arxiv.org/abs/cond-mat/0301137v1

Eur. Phys. J. B 32, 429 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 5 figures

Scientific paper

10.1140/epjb/e2003-00121-8

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.

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