Self-energy-functional theory

Details Self-energy-functional theory Self-energy-functional theory

2011-08-10

arxiv.org/abs/1108.2183v1

Physics

Condensed Matter

Strongly Correlated Electrons

chapter in "Theoretical Methods for Strongly Correlated Systems", edited by A. Avella and F. Mancini, Springer (2011), 38 page

Scientific paper

10.1007/978-3-642-21831-6

Self-energy-functional theory is a formal framework which allows to derive non-perturbative and thermodynamically consistent approximations for lattice models of strongly correlated electrons from a general dynamical variational principle. The construction of the self-energy functional and the corresponding variational principle is developed within the path-integral formalism. Different cluster mean-field approximations, like the variational cluster approximation and cluster extensions of dynamical mean-field theory are derived in this context and their mutual relationship and internal consistency are discussed.

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